A Brazilian police officer stands near Amazon Indian women as Indians from different tribes hold a meeting with a government envoy to discuss a proposal to end their occupation of the Belo Monte hydroelectric dam construction site, in Vitoria do Xingu, near Altamira in Para State, May 8, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed for the past seven days the construction of the dam, projected to become the world's third largest in energy production, and that they oppose for its impact on the environment and their livelihoods. The government sent a proposal for a negotiated settlement on the demands of the Indians, who responded that they are open to dialogue but need more time to study the proposal. REUTERS/Lunae Parracho (BRAZIL - Tags: ENERGY ENVIRONMENT CIVIL UNREST POLITICS)

An Amazon Indian helps guard the entrance to the Belo Monte hydroelectric dam construction site on the seventh day of their occupation of the site in Vitoria do Xingu, near Altamira in Para State, May 8, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed for the past seven days the construction of the dam, projected to become the world's third largest in energy production, and that they oppose for its impact on the environment and their livelihoods. The government sent a proposal for a negotiated settlement on the demands of the Indians, who responded that they are open to dialogue but need more time to study the proposal. REUTERS/Lunae Parracho (BRAZIL - Tags: ENERGY ENVIRONMENT CIVIL UNREST POLITICS)

Amazon Indians from different tribes guard the entrance to the Belo Monte hydroelectric dam construction site on the seventh day of their occupation of the site in Vitoria do Xingu, near Altamira in Para State, May 8, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed for the past seven days the construction of the dam, projected to become the world's third largest in energy production, and that they oppose for its impact on the environment and their livelihoods. The government sent a proposal for a negotiated settlement on the demands of the Indians, who responded that they are open to dialogue but need more time to study the proposal. REUTERS/Lunae Parracho (BRAZIL - Tags: ENERGY ENVIRONMENT CIVIL UNREST POLITICS)

Amazon Indians from different tribes hold a meeting among themselves to discuss a government proposal to end their occupation of the Belo Monte hydroelectric dam construction site, in the construction office at the dam in Vitoria do Xingu, near Altamira in Para State, May 8, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed for the past seven days the construction of the dam, projected to become the world's third largest in energy production, and that they oppose for its impact on the environment and their livelihoods. The government sent a proposal for a negotiated settlement on the demands of the Indians, who responded that they are open to dialogue but need more time to study the proposal. REUTERS/Lunae Parracho (BRAZIL - Tags: ENERGY ENVIRONMENT CIVIL UNREST POLITICS)

Amazon Indians from different tribes hold a meeting among themselves to discuss a government proposal to end their occupation of the Belo Monte hydroelectric dam construction site, in the construction office at the dam in Vitoria do Xingu, near Altamira in Para State, May 8, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed for the past seven days the construction of the dam, projected to become the world's third largest in energy production, and that they oppose for its impact on the environment and their livelihoods. The government sent a proposal for a negotiated settlement on the demands of the Indians, who responded that they are open to dialogue but need more time to study the proposal. The sign on the door reads, "Meeting room. Belo Monte." REUTERS/Lunae Parracho (BRAZIL - Tags: ENERGY ENVIRONMENT CIVIL UNREST POLITICS)

Amazon Indians from different tribes hold a meeting among themselves to discuss a government proposal to end their occupation of the Belo Monte hydroelectric dam construction site, in the construction office at the dam in Vitoria do Xingu, near Altamira in Para State, May 8, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed for the past seven days the construction of the dam, projected to become the world's third largest in energy production, and that they oppose for its impact on the environment and their livelihoods. The government sent a proposal for a negotiated settlement on the demands of the Indians, who responded that they are open to dialogue but need more time to study the proposal. REUTERS/Lunae Parracho (BRAZIL - Tags: ENERGY ENVIRONMENT CIVIL UNREST POLITICS)

Amazon Indians from different tribes hold a march to demonstrate their unity before delivering their response to a government proposal to end their occupation of the Belo Monte hydroelectric dam construction site, in Vitoria do Xingu, near Altamira in Para State, May 8, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed for the past seven days the construction of the dam, projected to become the world's third largest in energy production, and that they oppose for its impact on the environment and their livelihoods. The government sent a proposal for a negotiated settlement on the demands of the Indians, who responded that they are open to dialogue but need more time to study the proposal. REUTERS/Lunae Parracho (BRAZIL - Tags: ENERGY ENVIRONMENT CIVIL UNREST POLITICS)

Indian women hold a banner in front of police, as Amazon Indians from different tribes hold a meeting with a government envoy to discuss a proposal to end their occupation of the Belo Monte hydroelectric dam construction site, in Vitoria do Xingu, near Altamira in Para State, May 8, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed for the past seven days the construction of the dam, projected to become the world's third largest in energy production, and that they oppose for its impact on the environment and their livelihoods. The government sent a proposal for a negotiated settlement on the demands of the Indians, who responded that they are open to dialogue but need more time to study the proposal. The banner reads, "Respect our right." REUTERS/Lunae Parracho (BRAZIL - Tags: ENERGY ENVIRONMENT CIVIL UNREST POLITICS)

An Indian woman cradles her child while holding a banner in front of police, as Amazon Indians from different tribes hold a meeting with a government envoy to discuss a proposal to end their occupation of the Belo Monte hydroelectric dam construction site, in Vitoria do Xingu, near Altamira in Para State, May 8, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed for the past seven days the construction of the dam, projected to become the world's third largest in energy production, and that they oppose for its impact on the environment and their livelihoods. The government sent a proposal for a negotiated settlement on the demands of the Indians, who responded that they are open to dialogue but need more time to study the proposal. REUTERS/Lunae Parracho (BRAZIL - Tags: SOCIETY BUSINESS EMPLOYMENT ENVIRONMENT ENERGY CIVIL UNREST)

Amazon Indians from different tribes hold a march to demonstrate their unity before delivering their response to a government proposal to end their occupation of the Belo Monte hydroelectric dam construction site, in Vitoria do Xingu, near Altamira in Para State, May 8, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed for the past seven days the construction of the dam, projected to become the world's third largest in energy production, and that they oppose for its impact on the environment and their livelihoods. The government sent a proposal for a negotiated settlement on the demands of the Indians, who responded that they are open to dialogue but need more time to study the proposal. REUTERS/Lunae Parracho (BRAZIL - Tags: ENERGY ENVIRONMENT CIVIL UNREST POLITICS)

Amazon Indians from different tribes talk with Nilton Tubino (L), an envoy from the Brazilian government, about their response to a government proposal to end their occupation of the Belo Monte hydroelectric dam construction site, in Vitoria do Xingu, near Altamira in Para State, May 8, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed for the past seven days the construction of the dam, projected to become the world's third largest in energy production, and that they oppose for its impact on the environment and their livelihoods. The government sent a proposal for a negotiated settlement on the demands of the Indians, who responded that they are open to dialogue but need more time to study the proposal. REUTERS/Lunae Parracho (BRAZIL - Tags: ENERGY ENVIRONMENT CIVIL UNREST POLITICS)

Amazon Indians from different tribes talk with Nilton Tubino (R), an envoy from the Brazilian government, about their response to a government proposal to end their occupation of the Belo Monte hydroelectric dam construction site, in Vitoria do Xingu, near Altamira in Para State, May 8, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed for the past seven days the construction of the dam, projected to become the world's third largest in energy production, and that they oppose for its impact on the environment and their livelihoods. The government sent a proposal for a negotiated settlement on the demands of the Indians, who responded that they are open to dialogue but need more time to study the proposal. REUTERS/Lunae Parracho (BRAZIL - Tags: ENERGY ENVIRONMENT CIVIL UNREST POLITICS)

Amazon Indians from different tribes patrol inside the main construction site of the Belo Monte hydroelectric dam on the seventh day of their occupation of the site, in Vitoria do Xingu, near Altamira in Para State, May 8, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed for the past seven days the construction of the dam, projected to become the world's third largest in energy production, and that they oppose for its impact on the environment and their livelihoods. The government sent a proposal for a negotiated settlement on the demands of the Indians, who responded that they are open to dialogue but need more time to study the proposal. REUTERS/Lunae Parracho (BRAZIL - Tags: ENERGY ENVIRONMENT CIVIL UNREST POLITICS)

Amazon Indians from different tribes hold a march to demonstrate their unity before delivering their response to a government proposal to end their occupation of the Belo Monte hydroelectric dam construction site, in Vitoria do Xingu, near Altamira in Para State, May 8, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed for the past seven days the construction of the dam, projected to become the world's third largest in energy production, and that they oppose for its impact on the environment and their livelihoods. The government sent a proposal for a negotiated settlement on the demands of the Indians, who responded that they are open to dialogue but need more time to study the proposal. REUTERS/Lunae Parracho (BRAZIL - Tags: ENERGY ENVIRONMENT CIVIL UNREST POLITICS)

Amazon Indians from different tribes hold a march to demonstrate their unity before delivering their response to a government proposal to end their occupation of the Belo Monte hydroelectric dam construction site, in Vitoria do Xingu, near Altamira in Para State, May 8, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed for the past seven days the construction of the dam, projected to become the world's third largest in energy production, and that they oppose for its impact on the environment and their livelihoods. The government sent a proposal for a negotiated settlement on the demands of the Indians, who responded that they are open to dialogue but need more time to study the proposal. REUTERS/Lunae Parracho (BRAZIL - Tags: ENERGY ENVIRONMENT CIVIL UNREST POLITICS)

Amazon Indians from different tribes hold a march to demonstrate their unity before delivering their response to a government proposal to end their occupation of the Belo Monte hydroelectric dam construction site, in Vitoria do Xingu, near Altamira in Para State, May 8, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed for the past seven days the construction of the dam, projected to become the world's third largest in energy production, and that they oppose for its impact on the environment and their livelihoods. The government sent a proposal for a negotiated settlement on the demands of the Indians, who responded that they are open to dialogue but need more time to study the proposal. REUTERS/Lunae Parracho (BRAZIL - Tags: ENERGY ENVIRONMENT CIVIL UNREST POLITICS)

Amazon Indians from different tribes hold a march to demonstrate their unity before delivering their response to a government proposal to end their occupation of the Belo Monte hydroelectric dam construction site, in Vitoria do Xingu, near Altamira in Para State, May 8, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed for the past seven days the construction of the dam, projected to become the world's third largest in energy production, and that they oppose for its impact on the environment and their livelihoods. The government sent a proposal for a negotiated settlement on the demands of the Indians, who responded that they are open to dialogue but need more time to study the proposal. REUTERS/Lunae Parracho (BRAZIL - Tags: ENERGY ENVIRONMENT CIVIL UNREST POLITICS)

Amazon Indians from different tribes hold a march to demonstrate their unity before delivering their response to a government proposal to end their occupation of the Belo Monte hydroelectric dam construction site, in Vitoria do Xingu, near Altamira in Para State, May 8, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed for the past seven days the construction of the dam, projected to become the world's third largest in energy production, and that they oppose for its impact on the environment and their livelihoods. The government sent a proposal for a negotiated settlement on the demands of the Indians, who responded that they are open to dialogue but need more time to study the proposal. REUTERS/Lunae Parracho (BRAZIL - Tags: ENERGY ENVIRONMENT CIVIL UNREST POLITICS TPX IMAGES OF THE DAY)

Indian leader Jairo Saw speaks to journalists at the entrance to the Belo Monte hydroelectric dam construction site, as Amazon Indians from different tribes continued to occupy the site for the fifth day in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 6, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed the construction of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. Picture taken May 6, 2013. REUTERS/Lunae Parracho (BRAZIL - Tags: SOCIETY BUSINESS EMPLOYMENT ENVIRONMENT ENERGY CIVIL UNREST)

An Amazon Indian woman demonstrates with Amazon Indians from different tribes at the entrance to the Belo Monte hydroelectric dam construction site as they continued to occupy the site for the fifth day in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 6, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed the construction of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. Picture taken May 6, 2013. REUTERS/Lunae Parracho (BRAZIL - Tags: SOCIETY BUSINESS EMPLOYMENT ENVIRONMENT ENERGY CIVIL UNREST)

Brazilian police inspect the items being carried by Amazon Indians as they bring food and supplies to members of their tribes who are occupying the Belo Monte hydroelectric dam construction site for the fifth day in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 6, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed the construction of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. Picture taken May 6, 2013. REUTERS/Lunae Parracho (BRAZIL - Tags: SOCIETY BUSINESS EMPLOYMENT ENVIRONMENT ENERGY CIVIL UNREST)

Brazilian police inspect the items being carried by Amazon Indians as they bring food and supplies to members of their tribes who are occupying the Belo Monte hydroelectric dam construction site for the fifth day in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 6, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed the construction of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. Picture taken May 6, 2013. REUTERS/Lunae Parracho (BRAZIL - Tags: SOCIETY BUSINESS EMPLOYMENT ENVIRONMENT ENERGY CIVIL UNREST)

Amazon Indians from different tribes demonstrate at the entrance to the Belo Monte hydroelectric dam construction site as they continued to occupy the site for the fifth day in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 6, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed the construction of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. The banner reads, "We are decided. Not even the Tapajos complex." Picture taken May 6, 2013. REUTERS/Lunae Parracho (BRAZIL - Tags: SOCIETY BUSINESS EMPLOYMENT ENVIRONMENT ENERGY CIVIL UNREST)

Brazilian Congressman Padre Ton (2nd L, striped shirt), president of the Congressional Front for Indigenous Peoples, is escorted by Amazon Indians from different tribes as he manages to get police to allow him inside the Belo Monte hydroelectric dam construction site where the Indians are occupying the site in protest, in Vitoria do Xingu, near Altamira in Para State, May 5, 2012. Amazon Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed, for the past three days, the construction of the dam that is projected to become the world's third largest in energy production. They are demanding that the Brazilian government hold prior consultations with indigenous peoples before building dams that affect their lands and livelihoods, an issue that has sparked years of protests against the Belo Monte dam. Police expelled journalists from the site on Saturday. Picture taken May 5, 2013. REUTERS/Lunae Parracho (BRAZIL - Tags: ENERGY ENVIRONMENT POLITICS CIVIL UNREST)

Amazon Indians talk to police at the entrance to the Belo Monte hydroelectric dam construction site, as they continued their occupation of the area in Vitoria do Xingu, near Altamira in Para State, May 5, 2013. Amazon Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed, for the past three days, the construction of the dam that is projected to become the world's third largest in energy production. They are demanding that the Brazilian government hold prior consultations with indigenous peoples before building dams that affect their lands and livelihoods, an issue that has sparked years of protests against the Belo Monte dam. Police expelled journalists from the site on Saturday. Picture taken May 5, 2013. REUTERS/Lunae Parracho (BRAZIL - Tags: ENERGY ENVIRONMENT POLITICS CIVIL UNREST)

Amazon Indians stand near police at the entrance to the Belo Monte hydroelectric dam construction site, as they continued their occupation of the area in Vitoria do Xingu, near Altamira in Para State, May 5, 2013. Amazon Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed, for the past three days, the construction of the dam that is projected to become the world's third largest in energy production. They are demanding that the Brazilian government hold prior consultations with indigenous peoples before building dams that affect their lands and livelihoods, an issue that has sparked years of protests against the Belo Monte dam. Police expelled journalists from the site on Saturday. Picture taken May 5, 2013. REUTERS/Lunae Parracho (BRAZIL - Tags: ENERGY ENVIRONMENT POLITICS CIVIL UNREST)

Munduruku Indian warriors patrol the entrance to the Belo Monte hydroelectric dam construction site, in Vitoria do Xingu, near Altamira in Para State, May 5, 2013. Amazon Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed, for the past three days, the construction of the dam that is projected to become the world's third largest in energy production. They are demanding that the Brazilian government hold prior consultations with indigenous peoples before building dams that affect their lands and livelihoods, an issue that has sparked years of protests against the Belo Monte dam. Police expelled journalists from the site on Saturday. Picture taken May 5, 2013. REUTERS/Lunae Parracho (BRAZIL - Tags: ENERGY ENVIRONMENT POLITICS CIVIL UNREST)

A Munduruku Indian named Paygomuyatpu takes photos with a camera left for him to use by a journalist who was expelled from the Belo Monte hydroelectric dam construction site, in Vitoria do Xingu, near Altamira in Para State, May 5, 2013. Amazon Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed, for the past three days, the construction of the dam that is projected to become the world's third largest in energy production. They are demanding that the Brazilian government hold prior consultations with indigenous peoples before building dams that affect their lands and livelihoods, an issue that has sparked years of protests against the Belo Monte dam. Police expelled journalists from the site on Saturday. Picture taken May 5, 2013. REUTERS/Lunae Parracho (BRAZIL - Tags: ENERGY ENVIRONMENT POLITICS CIVIL UNREST)

Amazon Indians from different tribes gather to show their unity as they continue their occupation of the Belo Monte hydroelectric dam construction site for the second day, in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 3, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed the construction of the dam, projected to become the world's third largest in energy production. They are demanding that the Brazilian government hold prior consultations with indigenous peoples before building dams that affect their lands and livelihoods, an issue that has sparked years of protests against the Belo Monte dam. Picture taken May 3, 2013. REUTERS/Lunae Parracho (BRAZIL - Tags: SOCIETY BUSINESS EMPLOYMENT ENVIRONMENT ENERGY CIVIL UNREST)

Amazon Indians speak to government envoy Avelino Ganzer (R) as a group of more than 200 Indians continued their occupation of the Belo Monte hydroelectric dam construction site for the second day, in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 3, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed the construction of the dam, projected to become the world's third largest in energy production. They are demanding that the Brazilian government hold prior consultations with indigenous peoples before building dams that affect their lands and livelihoods, an issue that has sparked years of protests against the Belo Monte dam. Picture taken May 3, 2013. REUTERS/Lunae Parracho (BRAZIL - Tags: ENVIRONMENT ENERGY CIVIL UNREST POLITICS)

Amazon Indians from different tribes gather to show their unity as they continue their occupation of the Belo Monte hydroelectric dam construction site for the second day, in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 3, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed the construction of the dam, projected to become the world's third largest in energy production. They are demanding that the Brazilian government hold prior consultations with indigenous peoples before building dams that affect their lands and livelihoods, an issue that has sparked years of protests against the Belo Monte dam. Picture taken May 3, 2013. REUTERS/Lunae Parracho (BRAZIL - Tags: SOCIETY BUSINESS EMPLOYMENT ENVIRONMENT ENERGY CIVIL UNREST)

An Amazon Indian (L) speaks to government envoy Avelino Ganzer (C, pink shirt) and riot police through a megaphone, as a group of more than 200 Indians continued their occupation of the Belo Monte hydroelectric dam construction site for the second day, in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 3, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed the construction of the dam, projected to become the world's third largest in energy production. They are demanding that the Brazilian government hold prior consultations with indigenous peoples before building dams that affect their lands and livelihoods, an issue that has sparked years of protests against the Belo Monte dam. Picture taken May 3, 2013. REUTERS/Lunae Parracho (BRAZILEMPLOYMENT - Tags: ENVIRONMENT ENERGY CIVIL UNREST POLITICS)

Amazon Indians ride on the back of a pickup truck as they continue their occupation of the Belo Monte hydroelectric dam construction site for the second day, in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 3, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed the construction of the dam, projected to become the world's third largest in energy production. They are demanding that the Brazilian government hold prior consultations with indigenous peoples before building dams that affect their lands and livelihoods, an issue that has sparked years of protests against the Belo Monte dam. Picture taken May 3, 2013. REUTERS/Lunae Parracho (BRAZIL - Tags: SOCIETY BUSINESS EMPLOYMENT ENVIRONMENT ENERGY CIVIL UNREST)

Amazon Indians ride in the back of a pickup truck as they continue their occupation of the Belo Monte hydroelectric dam construction site for the second day, in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 3, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed the construction of the dam, projected to become the world's third largest in energy production. They are demanding that the Brazilian government hold prior consultations with indigenous peoples before building dams that affect their lands and livelihoods, an issue that has sparked years of protests against the Belo Monte dam. Picture taken May 3, 2013. REUTERS/Lunae Parracho (BRAZIL - Tags: SOCIETY BUSINESS EMPLOYMENT ENVIRONMENT ENERGY CIVIL UNREST)

Amazon Indians from different tribes perform a dance to show their unity as they continue their occupation of the Belo Monte hydroelectric dam construction site for the second day, in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 3, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed the construction of the dam, projected to become the world's third largest in energy production. They are demanding that the Brazilian government hold prior consultations with indigenous peoples before building dams that affect their lands and livelihoods, an issue that has sparked years of protests against the Belo Monte dam. Picture taken May 3, 2013. REUTERS/Lunae Parracho (BRAZIL - Tags: SOCIETY BUSINESS EMPLOYMENT ENVIRONMENT ENERGY CIVIL UNREST)

Amazon Indians from different tribes perform a dance to show their unity as they continue their occupation of the Belo Monte hydroelectric dam construction site for the second day, in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 3, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed the construction of the dam, projected to become the world's third largest in energy production. They are demanding that the Brazilian government hold prior consultations with indigenous peoples before building dams that affect their lands and livelihoods, an issue that has sparked years of protests against the Belo Monte dam. Picture taken May 3, 2013. REUTERS/Lunae Parracho (BRAZIL - Tags: ENVIRONMENT ENERGY CIVIL UNREST POLITICS TPX IMAGES OF THE DAY)

Workers employed in the construction of the Belo Monte hydroelectric dam project watch as a group of Amazon Indians, who are occupying for the second day the main construction site in protest against the dam's construction, patrol the site in Vitoria do Xingu, near Altamira in Para State May 3, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana, and Arara tribes have paralyzed the construction of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. On the second day, the Indians received the support of many of the construction laborers. REUTERS/Lunae Parracho (BRAZIL - Tags: BUSINESS EMPLOYMENT ENVIRONMENT ENERGY CIVIL UNREST SOCIETY)

Workers employed in the construction of the Belo Monte hydroelectric dam project cheer for, and take photos with a group of Amazon Indians, who are occupying for the second day the main construction site in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 3, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana, and Arara tribes have paralyzed the construction of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. On the second day of the protest, the Indians received the support of many of the construction laborers. REUTERS/Lunae Parracho (BRAZIL - Tags: BUSINESS EMPLOYMENT ENVIRONMENT ENERGY CIVIL UNREST SOCIETY)

Workers (L) employed in the construction of the Belo Monte hydroelectric dam project take pictures of a group of Amazon Indians, who are occupying for the second day the main construction site in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State May 3, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana, and Arara tribes have paralyzed the construction of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. On the second day, the Indians received the support of many of the construction laborers. REUTERS/Lunae Parracho (BRAZIL - Tags: BUSINESS EMPLOYMENT ENVIRONMENT ENERGY CIVIL UNREST SOCIETY)

Workers employed in the construction of the Belo Monte hydroelectric dam project take pictures of a group of Amazon Indians, who are occupying for the second day the main construction site in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State May 3, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana, and Arara tribes have paralyzed the construction of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. On the second day, the Indians received the support of many of the construction laborers. REUTERS/Lunae Parracho (BRAZIL - Tags: BUSINESS EMPLOYMENT ENVIRONMENT ENERGY CIVIL UNREST SOCIETY)

Amazon Indians patrol in a pickup truck the main construction site of the Belo Monte hydroelectric dam project, as they occupy it for the second day in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State May 3, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana, and Arara tribes have paralyzed the construction of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. REUTERS/Lunae Parracho (BRAZIL - Tags: BUSINESS EMPLOYMENT ENVIRONMENT ENERGY CIVIL UNREST SOCIETY)

Amazon Indians walk around the main construction site of the Belo Monte hydroelectric dam project, as they occupy it for the second day in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State May 3, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana, and Arara tribes have paralyzed the construction of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. REUTERS/Lunae Parracho (BRAZIL - Tags: BUSINESS EMPLOYMENT ENVIRONMENT ENERGY CIVIL UNREST SOCIETY)

Workers employed in the construction of the Belo Monte hydroelectric dam project cheer a group of Amazon Indians (R), who are occupying for the second day the project's main construction site in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 3, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana, and Arara tribes have paralyzed the construction of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. On the second day of protests, the Indians received the support of many of the construction laborers. REUTERS/Lunae Parracho (BRAZIL - Tags: CIVIL UNREST ENERGY ENVIRONMENT TPX IMAGES OF THE DAY SOCIETY BUSINESS EMPLOYMENT)

Amazon Indians halt a vehicle carrying workers employed in the construction of the Belo Monte hydroelectric dam project, as they occupy for the second day the project's main construction site in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 3, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana and Arara tribes have paralyzed the construction of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. REUTERS/Lunae Parracho (BRAZIL - Tags: SOCIETY BUSINESS EMPLOYMENT ENVIRONMENT ENERGY CIVIL UNREST)

Amazon Indians from the Xingu, Tapajos and Teles Pires river basins argue with Luis Antonio (C), one of the supervisors of the Belo Monte hydroelectric dam project, as they invade the main construction site in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 2, 2013. The Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana, and Arara tribes are trying to force the paralyzation of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. The protesters said in an open letter that they want a dialogue with the government. REUTERS/Lunae Parracho (BRAZIL - Tags: ENVIRONMENT CIVIL UNREST POLITICS ENERGY)

Amazon Indians from the Xingu, Tapajos and Teles Pires river basins face a riot police officer as they invade the main construction site of the Belo Monte hydroelectric dam site in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 2, 2013. The Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana, and Arara tribes are trying to force the paralyzation of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. The protesters said in an open letter that they want a dialogue with the government. The shirt reads, "Proud to be Indian." REUTERS/Lunae Parracho (BRAZIL - Tags: ENVIRONMENT CIVIL UNREST POLITICS ENERGY)

Amazon Indians from the Xingu, Tapajos and Teles Pires river basins face a riot police officer as they invade the main construction site of the Belo Monte hydroelectric dam site in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 2, 2013. The Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana, and Arara tribes are trying to force the paralyzation of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. The protesters said in an open letter that they want a dialogue with the government. The shirt reads, "Proud to be Indian." REUTERS/Lunae Parracho (BRAZIL - Tags: ENVIRONMENT CIVIL UNREST POLITICS ENERGY TPX IMAGES OF THE DAY)

Amazon Indians from the Xingu, Tapajos and Teles Pires river basins face a riot police officer as they invade the main construction site of the Belo Monte hydroelectric dam site in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 2, 2013. The Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana, and Arara tribes are trying to force the paralyzation of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. The protesters said in an open letter that they want a dialogue with the government. The shirt reads, "Proud to be Indian." REUTERS/Lunae Parracho (BRAZIL - Tags: ENVIRONMENT CIVIL UNREST POLITICS ENERGY)

An Amazon Indian stands outside a fence where riot police protect workers of the construction site of the Belo Monte hydroelectric dam, as dozens of Indians invaded the site in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 2, 2013. The Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana, and Arara tribes are trying to force the paralyzation of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. The protesters said in an open letter that they want a dialogue with the government. REUTERS/Lunae Parracho (BRAZIL - Tags: ENVIRONMENT CIVIL UNREST POLITICS ENERGY)

Amazon Indians from the Xingu, Tapajos and Teles Pires river basins invade the main construction site of the Belo Monte hydroelectric dam site in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 2, 2013. The Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana, and Arara tribes are trying to force the paralyzation of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. The protesters said in an open letter that they want a dialogue with the government. REUTERS/Lunae Parracho (BRAZIL - Tags: ENVIRONMENT CIVIL UNREST POLITICS ENERGY)

Amazon Indians from the Xingu, Tapajos and Teles Pires river basins face a riot police officer as they invade the main construction site of the Belo Monte hydroelectric dam site in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 2, 2013. The Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana, and Arara tribes are trying to force the paralyzation of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. The protesters said in an open letter that they want a dialogue with the government. REUTERS/Lunae Parracho (BRAZIL - Tags: ENVIRONMENT CIVIL UNREST POLITICS ENERGY)

Amazon Indians from the Xingu, Tapajos and Teles Pires river basins face a riot police officer as they invade the main construction site of the Belo Monte hydroelectric dam site in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 2, 2013. The Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana, and Arara tribes are trying to force the paralyzation of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. The protesters said in an open letter that they want a dialogue with the government. REUTERS/Lunae Parracho (BRAZIL - Tags: ENVIRONMENT CIVIL UNREST POLITICS ENERGY TPX IMAGES OF THE DAY)

Amazon Indians from the Xingu, Tapajos and Teles Pires river basins invade the main construction site of the Belo Monte hydroelectric dam site in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 2, 2013. The Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana, and Arara tribes are trying to force the paralyzation of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. The protesters said in an open letter that they want a dialogue with the government. REUTERS/Lunae Parracho (BRAZIL - Tags: ENVIRONMENT CIVIL UNREST POLITICS ENERGY)

Amazon Indians from the Xingu, Tapajos and Teles Pires river basins argue with Luis Antonio (C), one of the supervisors of the Belo Monte hydroelectric dam project, as they invade the main construction site in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 2, 2013. The Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana, and Arara tribes are trying to force the paralyzation of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. The protesters said in an open letter that they want a dialogue with the government. REUTERS/Lunae Parracho (BRAZIL - Tags: ENVIRONMENT CIVIL UNREST POLITICS ENERGY)

Amazon Indians from the Xingu, Tapajos and Teles Pires river basins argue with Luis Antonio (C), one of the supervisors of the Belo Monte hydroelectric dam project, as they invade the main construction site in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 2, 2013. The Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana, and Arara tribes are trying to force the paralyzation of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. The protesters said in an open letter that they want a dialogue with the government. REUTERS/Lunae Parracho (BRAZIL - Tags: ENVIRONMENT CIVIL UNREST POLITICS ENERGY TPX IMAGES OF THE DAY)

An Amazon Indian invades the main construction site of the Belo Monte hydroelectric dam site in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 2, 2013. Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana, and Arara tribes are trying to force the paralyzation of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. The protesters said in an open letter that they want a dialogue with the government. The sign indicates which direction to different parts of the site, with the main offices to the right. REUTERS/Lunae Parracho (BRAZIL - Tags: ENVIRONMENT CIVIL UNREST POLITICS ENERGY)

Amazon Indians from the Xingu, Tapajos and Teles Pires river basins invade the main construction site of the Belo Monte hydroelectric dam site in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 2, 2013. The Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana, and Arara tribes are trying to force the paralyzation of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. The protesters said in an open letter that they want a dialogue with the government. REUTERS/Lunae Parracho (BRAZIL - Tags: ENVIRONMENT CIVIL UNREST POLITICS ENERGY)

Amazon Indians from the Xingu, Tapajos and Teles Pires river basins are met by a riot police officer as they invade the main construction site of the Belo Monte hydroelectric dam site in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 2, 2013. The Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana, and Arara tribes are trying to force the paralyzation of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. The protesters said in an open letter that they want a dialogue with the government. REUTERS/Lunae Parracho (BRAZIL - Tags: ENVIRONMENT CIVIL UNREST POLITICS ENERGY)

Amazon Indians from the Xingu, Tapajos and Teles Pires river basins oblige a truck driver to abandon his vehicle as they invade the main construction site of the Belo Monte hydroelectric dam site in protest against the dam's construction, in Vitoria do Xingu, near Altamira in Para State, May 2, 2013. The Indians from the Munduruku, Juruna, Kayapo, Xipaya, Kuruaya, Asurini, Parakana, and Arara tribes are trying to force the paralyzation of the dam, projected to become the world's third largest in energy production, that they oppose for its impact on the environment and their livelihoods. The protesters said in an open letter that they want a dialogue with the government. REUTERS/Lunae Parracho (BRAZIL - Tags: ENVIRONMENT CIVIL UNREST POLITICS ENERGY)

A native from the Parakana tribe holds his bow and arrow before competing at the III Traditional Indian Games of Para State, taking place in Conceicao do Araguaia in the Brazilian Amazon region, August 20, 2006. REUTERS/Paulo Santos-Interfoto