Yanomami indians follow agents of Brazil's environmental agency in a gold mine during an operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 17, 2016. Picture taken April 17, 2016. REUTERS/Bruno Kelly

A Yanomami indian follows agents of Brazil's environmental agency in a gold mine during an operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 17, 2016. Picture taken April 17, 2016. REUTERS/Bruno Kelly

A mining ferry burns down at the banks of Uraricoera River during Brazil’s environmental agency operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 15, 2016. At over 9.5 million hectares, the Yanomami territory is twice the size of Switzerland and home to around 27,000 indians. The land has legally belonged to the Yanomami since 1992, but illegal miners continue to plague the area, sawing down trees and poisoning rivers with mercury in their lust for gold. REUTERS/Bruno Kelly SEARCH "AMAZON GOLD" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

An agent of Brazil’s environmental agency burns a miners camp on the banks of Uraricoera River during an operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 15, 2016. At over 9.5 million hectares, the Yanomami territory is twice the size of Switzerland and home to around 27,000 indians. The land has legally belonged to the Yanomami since 1992, but illegal miners continue to plague the area, sawing down trees and poisoning rivers with mercury in their lust for gold. REUTERS/Bruno Kelly SEARCH "AMAZON GOLD" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

An agent of Brazil’s environmental agency inspects a miners camp on the banks of Uraricoera River during an operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 15, 2016. At over 9.5 million hectares, the Yanomami territory is twice the size of Switzerland and home to around 27,000 indians. The land has legally belonged to the Yanomami since 1992, but illegal miners continue to plague the area, sawing down trees and poisoning rivers with mercury in their lust for gold. REUTERS/Bruno Kelly SEARCH "AMAZON GOLD" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

An agent of Brazil’s environmental agency takes cover as an illegal gold dredge burns down at the banks of Uraricoera River during an operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 15, 2016. At over 9.5 million hectares, the Yanomami territory is twice the size of Switzerland and home to around 27,000 indians. The land has legally belonged to the Yanomami since 1992, but illegal miners continue to plague the area, sawing down trees and poisoning rivers with mercury in their lust for gold. REUTERS/Bruno Kelly SEARCH "AMAZON GOLD" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY

An agent of Brazil’s environmental agency detains a gold prospector who works as a diver in the illegal gold dredge on the shores of Uraricoera River, during an operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 15, 2016. At over 9.5 million hectares, the Yanomami territory is twice the size of Switzerland and home to around 27,000 indians. The land has legally belonged to the Yanomami since 1992, but illegal miners continue to plague the area, sawing down trees and poisoning rivers with mercury in their lust for gold. REUTERS/Bruno Kelly SEARCH "AMAZON GOLD" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

A gold prospector is detained by agents of Brazil’s environmental agency on the Uraricoera River during an operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 15, 2016. At over 9.5 million hectares, the Yanomami territory is twice the size of Switzerland and home to around 27,000 indians. The land has legally belonged to the Yanomami since 1992, but illegal miners continue to plague the area, sawing down trees and poisoning rivers with mercury in their lust for gold. REUTERS/Bruno Kelly SEARCH "AMAZON GOLD" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY

Yanomami indian children are seen near the Uraricoera River during Brazil’s environmental agency operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 16, 2016. At over 9.5 million hectares, the Yanomami territory is twice the size of Switzerland and home to around 27,000 indians. The land has legally belonged to the Yanomami since 1992, but illegal miners continue to plague the area, sawing down trees and poisoning rivers with mercury in their lust for gold. REUTERS/Bruno Kelly SEARCH "AMAZON GOLD" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

A man flees successfully near the banks of Uraricoera River during Brazil’s environmental agency operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 15, 2016. At over 9.5 million hectares, the Yanomami territory is twice the size of Switzerland and home to around 27,000 indians. The land has legally belonged to the Yanomami since 1992, but illegal miners continue to plague the area, sawing down trees and poisoning rivers with mercury in their lust for gold. REUTERS/Bruno Kelly SEARCH "AMAZON GOLD" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

An agent of Brazil’s environmental agency detains a man at an illegal gold mine during an operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 18, 2016. At over 9.5 million hectares, the Yanomami territory is twice the size of Switzerland and home to around 27,000 indians. The land has legally belonged to the Yanomami since 1992, but illegal miners continue to plague the area, sawing down trees and poisoning rivers with mercury in their lust for gold. REUTERS/Bruno Kelly SEARCH "AMAZON GOLD" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

An agents of Brazil’s environmental agency shows ammunition found in a camp used by gold miners during an operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 18, 2016. At over 9.5 million hectares, the Yanomami territory is twice the size of Switzerland and home to around 27,000 indians. The land has legally belonged to the Yanomami since 1992, but illegal miners continue to plague the area, sawing down trees and poisoning rivers with mercury in their lust for gold. REUTERS/Bruno Kelly SEARCH "AMAZON GOLD" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

An agent of Brazil’s environmental agency patrols the banks of Uraricoera River during an operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 15, 2016. At over 9.5 million hectares, the Yanomami territory is twice the size of Switzerland and home to around 27,000 indians. The land has legally belonged to the Yanomami since 1992, but illegal miners continue to plague the area, sawing down trees and poisoning rivers with mercury in their lust for gold. REUTERS/Bruno Kelly SEARCH "AMAZON GOLD" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

A village of indigenous Yanomami is seen during Brazil’s environmental agency operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 18, 2016. At over 9.5 million hectares, the Yanomami territory is twice the size of Switzerland and home to around 27,000 indians. The land has legally belonged to the Yanomami since 1992, but illegal miners continue to plague the area, sawing down trees and poisoning rivers with mercury in their lust for gold. REUTERS/Bruno Kelly SEARCH "AMAZON GOLD" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

An illegal gold dredge is seen burning down at the banks of Uraricoera River during Brazil’s environmental agency operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 15, 2016. At over 9.5 million hectares, the Yanomami territory is twice the size of Switzerland and home to around 27,000 indians. The land has legally belonged to the Yanomami since 1992, but illegal miners continue to plague the area, sawing down trees and poisoning rivers with mercury in their lust for gold. REUTERS/Bruno Kelly SEARCH "AMAZON GOLD" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

Uraricoera River is seen during Brazil’s environmental agency operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 15, 2016. At over 9.5 million hectares, the Yanomami territory is twice the size of Switzerland and home to around 27,000 indians. The land has legally belonged to the Yanomami since 1992, but illegal miners continue to plague the area, sawing down trees and poisoning rivers with mercury in their lust for gold. REUTERS/Bruno Kelly SEARCH "AMAZON GOLD" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

An illegal gold mine burns during Brazil’s environmental agency operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 17, 2016. At over 9.5 million hectares, the Yanomami territory is twice the size of Switzerland and home to around 27,000 indians. The land has legally belonged to the Yanomami since 1992, but illegal miners continue to plague the area, sawing down trees and poisoning rivers with mercury in their lust for gold. REUTERS/Bruno Kelly SEARCH "AMAZON GOLD" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

Gold prospectors are detained by agents of Brazil’s environmental agency on the Uraricoera River during an operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 16, 2016. At over 9.5 million hectares, the Yanomami territory is twice the size of Switzerland and home to around 27,000 indians. The land has legally belonged to the Yanomami since 1992, but illegal miners continue to plague the area, sawing down trees and poisoning rivers with mercury in their lust for gold. REUTERS/Bruno Kelly SEARCH "AMAZON GOLD" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

People successfully flee with groceries and fuel on a boat on the Uraricoera River during Brazil’s environmental agency operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 15, 2016. At over 9.5 million hectares, the Yanomami territory is twice the size of Switzerland and home to around 27,000 indians. The land has legally belonged to the Yanomami since 1992, but illegal miners continue to plague the area, sawing down trees and poisoning rivers with mercury in their lust for gold. REUTERS/Bruno Kelly SEARCH "AMAZON GOLD" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY

A man successfully flees in a boat next to an illegal gold dredge on the banks of Uraricoera River during Brazil’s environmental agency operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 15, 2016. At over 9.5 million hectares, the Yanomami territory is twice the size of Switzerland and home to around 27,000 indians. The land has legally belonged to the Yanomami since 1992, but illegal miners continue to plague the area, sawing down trees and poisoning rivers with mercury in their lust for gold. REUTERS/Bruno Kelly SEARCH "AMAZON GOLD" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

An Yanomami indian (R) stands near an illegal gold mine during Brazil’s environmental agency operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 17, 2016. At over 9.5 million hectares, the Yanomami territory is twice the size of Switzerland and home to around 27,000 indians. The land has legally belonged to the Yanomami since 1992, but illegal miners continue to plague the area, sawing down trees and poisoning rivers with mercury in their lust for gold. REUTERS/Bruno Kelly SEARCH "AMAZON GOLD" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

An agent of Brazil’s environmental agency is seen next to an illegal gold dredge burning down at the banks of Uraricoera River during an operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 15, 2016. At over 9.5 million hectares, the Yanomami territory is twice the size of Switzerland and home to around 27,000 indians. The land has legally belonged to the Yanomami since 1992, but illegal miners continue to plague the area, sawing down trees and poisoning rivers with mercury in their lust for gold. REUTERS/Bruno Kelly SEARCH "AMAZON GOLD" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

A helicopter patrols an illegal lane used by miners during Brazil’s environmental agency operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 17, 2016. At over 9.5 million hectares, the Yanomami territory is twice the size of Switzerland and home to around 27,000 indians. The land has legally belonged to the Yanomami since 1992, but illegal miners continue to plague the area, sawing down trees and poisoning rivers with mercury in their lust for gold. REUTERS/Bruno Kelly SEARCH "AMAZON GOLD" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY

An illegal gold mine is seen during Brazil’s environmental agency operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 17, 2016. At over 9.5 million hectares, the Yanomami territory is twice the size of Switzerland and home to around 27,000 indians. The land has legally belonged to the Yanomami since 1992, but illegal miners continue to plague the area, sawing down trees and poisoning rivers with mercury in their lust for gold. REUTERS/Bruno Kelly SEARCH "AMAZON GOLD" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

At over 9.5 million hectares, the Yanomami territory is twice the size of Switzerland and home to around 27,000 indians. The land has legally belonged to the Yanomami since 1992, but illegal miners continue to plague the area, sawing down trees and poisoning rivers with mercury in their lust for gold. REUTERS/Bruno Kelly Matching text BRAZIL-ENVIRONMENT/AMAZON SEARCH "AMAZON GOLD" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY

A map placed in the cockpit of a helicopter shows the area of the Yanomami indians during Brazil’s environmental agency operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 18, 2016. At over 9.5 million hectares, the Yanomami territory is twice the size of Switzerland and home to around 27,000 indians. The land has legally belonged to the Yanomami since 1992, but illegal miners continue to plague the area, sawing down trees and poisoning rivers with mercury in their lust for gold. REUTERS/Bruno Kelly SEARCH "AMAZON GOLD" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

Yanomami indians follow agents of Brazil’s environmental agency in an illegal gold mine during an operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 17, 2016. At over 9.5 million hectares, the Yanomami territory is twice the size of Switzerland and home to around 27,000 indians. The land has legally belonged to the Yanomami since 1992, but illegal miners continue to plague the area, sawing down trees and poisoning rivers with mercury in their lust for gold. REUTERS/Bruno Kelly SEARCH "AMAZON GOLD" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

Agents of Brazil’s environmental agency check an illegal gold mine during an operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 18, 2016. At over 9.5 million hectares, the Yanomami territory is twice the size of Switzerland and home to around 27,000 indians. The land has legally belonged to the Yanomami since 1992, but illegal miners continue to plague the area, sawing down trees and poisoning rivers with mercury in their lust for gold. REUTERS/Bruno Kelly SEARCH "AMAZON GOLD" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

An Yanomami indian stands near an illegal gold mine during Brazil’s environmental agency operation against illegal gold mining on indigenous land, in the heart of the Amazon rainforest, in Roraima state, Brazil April 17, 2016. At over 9.5 million hectares, the Yanomami territory is twice the size of Switzerland and home to around 27,000 indians. The land has legally belonged to the Yanomami since 1992, but illegal miners continue to plague the area, sawing down trees and poisoning rivers with mercury in their lust for gold. REUTERS/Bruno Kelly SEARCH "AMAZON GOLD" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY

Yanomami Indians sit around a fire at the community of Irotatheri, during a government trip for journalists, in the southern Amazonas state of Venezuela, just 19km (12 miles) from Brazil's border, September 7, 2012. The Venezuela government and indigenous groups are disputing whether an alleged massacre of Amazon villagers took place after the government said it found no evidence of an attack. A group representing the Yanomami tribe last week said that Brazilian gold miners had crossed the border and attacked a village from a helicopter. Venezuelan officials said over the weekend that flyovers of the area led them to believe that the allegations were false. Picture taken September 7, 2012. REUTERS/Carlos Garcia Rawlins (VENEZUELA - Tags: POLITICS SOCIETY)

Yanomami Indians sleep on hammocks at their shack at the community of Irotatheri, during a government trip for journalists, in the southern Amazonas state of Venezuela, just 19km (12 miles) from Brazil's border, September 7, 2012. The Venezuela government and indigenous groups are disputing whether an alleged massacre of Amazon villagers took place after the government said it found no evidence of an attack. A group representing the Yanomami tribe last week said that Brazilian gold miners had crossed the border and attacked a village from a helicopter. Venezuelan officials said over the weekend that flyovers of the area led them to believe that the allegations were false. Picture taken September 7, 2012. REUTERS/Carlos Garcia Rawlins (VENEZUELA - Tags: POLITICS SOCIETY)

A Yanomami Indian boy removes chiggers, the larvae of mites, from a fellow Yanomami at the community of Irotatheri, during a government trip for journalists, in the southern Amazonas state of Venezuela, just 19km (12 miles) from Brazil's border, September 7, 2012. The Venezuela government and indigenous groups are disputing whether an alleged massacre of Amazon villagers took place after the government said it found no evidence of an attack. A group representing the Yanomami tribe last week said that Brazilian gold miners had crossed the border and attacked a village from a helicopter. Venezuelan officials said over the weekend that flyovers of the area led them to believe that the allegations were false. Picture taken September 7, 2012. REUTERS/Carlos Garcia Rawlins (VENEZUELA - Tags: POLITICS SOCIETY)

Yanomami Indians dance at the community of Irotatheri, during a government trip for journalists, in the southern Amazonas state of Venezuela, just 19km (12 miles) from Brazil's border, September 7, 2012. The Venezuela government and indigenous groups are disputing whether an alleged massacre of Amazon villagers took place after the government said it found no evidence of an attack. A group representing the Yanomami tribe last week said that Brazilian gold miners had crossed the border and attacked a village from a helicopter. Venezuelan officials said over the weekend that flyovers of the area led them to believe that the allegations were false. Picture taken September 7, 2012. REUTERS/Carlos Garcia Rawlins (VENEZUELA - Tags: POLITICS SOCIETY)

A Yanomami Indian dances at the community of Irotatheri, during a government trip for journalists, in the southern Amazonas state of Venezuela, just 19km (12 miles) from Brazil's border, September 7, 2012. The Venezuela government and indigenous groups are disputing whether an alleged massacre of Amazon villagers took place after the government said it found no evidence of an attack. A group representing the Yanomami tribe last week said that Brazilian gold miners had crossed the border and attacked a village from a helicopter. Venezuelan officials said over the weekend that flyovers of the area led them to believe that the allegations were false. Picture taken September 7, 2012. REUTERS/Carlos Garcia Rawlins (VENEZUELA - Tags: POLITICS SOCIETY)

A Yanomami Indian woman takes care of children at the community of Irotatheri, during a government trip for journalists, in the southern Amazonas state of Venezuela, just 19km (12 miles) from Brazil's border, September 7, 2012. The Venezuela government and indigenous groups are disputing whether an alleged massacre of Amazon villagers took place after the government said it found no evidence of an attack. A group representing the Yanomami tribe last week said that Brazilian gold miners had crossed the border and attacked a village from a helicopter. Venezuelan officials said over the weekend that flyovers of the area led them to believe that the allegations were false. Picture taken September 7, 2012. REUTERS/Carlos Garcia Rawlins (VENEZUELA - Tags: POLITICS SOCIETY)

A Yanomami Indian looks on before performing a dance during a government trip for journalists at the community of Irotatheri in the southern Amazonas state of Venezuela, just 19km (12 miles) from Brazil's border, September 7, 2012. The Venezuela government and indigenous groups are disputing whether an alleged massacre of Amazon villagers took place after the government said it found no evidence of an attack. A group representing the Yanomami tribe last week said that Brazilian gold miners had crossed the border and attacked a village from a helicopter. Venezuelan officials said over the weekend that flyovers of the area led them to believe that the allegations were false. Picture taken September 7, 2012. REUTERS/Carlos Garcia Rawlins (VENEZUELA - Tags: POLITICS SOCIETY)

Yanomami Indians chat at the community of Irotatheri, during a government trip for journalists, in the southern Amazonas state of Venezuela, just 19km (12 miles) from Brazil's border, September 7, 2012. The Venezuela government and indigenous groups are disputing whether an alleged massacre of Amazon villagers took place after the government said it found no evidence of an attack. A group representing the Yanomami tribe last week said that Brazilian gold miners had crossed the border and attacked a village from a helicopter. Venezuelan officials said over the weekend that flyovers of the area led them to believe that the allegations were false. Picture taken September 7, 2012. REUTERS/Carlos Garcia Rawlins (VENEZUELA - Tags: POLITICS SOCIETY)

A Yanomami Indian chews leaves at the community of Irotatheri, during a government trip for journalists, in the southern Amazonas state of Venezuela, just 19km (12 miles) from Brazil's border, September 8, 2012. The Venezuela government and indigenous groups are disputing whether an alleged massacre of Amazon villagers took place after the government said it found no evidence of an attack. A group representing the Yanomami tribe last week said that Brazilian gold miners had crossed the border and attacked a village from a helicopter. Venezuelan officials said over the weekend that flyovers of the area led them to believe that the allegations were false. Picture taken September 8, 2012. REUTERS/Carlos Garcia Rawlins (VENEZUELA - Tags: POLITICS SOCIETY)

A Yanomami Indian boy looks on at a hammock at the community of Irotatheri, during a government trip for journalists, in the southern Amazonas state of Venezuela, just 19km (12 miles) from Brazil's border, September 8, 2012. The Venezuela government and indigenous groups are disputing whether an alleged massacre of Amazon villagers took place after the government said it found no evidence of an attack. A group representing the Yanomami tribe last week said that Brazilian gold miners had crossed the border and attacked a village from a helicopter. Venezuelan officials said over the weekend that flyovers of the area led them to believe that the allegations were false. Picture taken September 8, 2012. REUTERS/Carlos Garcia Rawlins (VENEZUELA - Tags: POLITICS SOCIETY)

A Yanomami Indian chews leaves at the community of Irotatheri, during a government trip for journalists, in the southern Amazonas state of Venezuela, just 19km (12 miles) from Brazil's border, September 8, 2012. The Venezuela government and indigenous groups are disputing whether an alleged massacre of Amazon villagers took place after the government said it found no evidence of an attack. A group representing the Yanomami tribe last week said that Brazilian gold miners had crossed the border and attacked a village from a helicopter. Venezuelan officials said over the weekend that flyovers of the area led them to believe that the allegations were false. Picture taken September 8, 2012. REUTERS/Carlos Garcia Rawlins (VENEZUELA - Tags: POLITICS SOCIETY)

Yanomami Indians sit around a fire at the community of Irotatheri, during a government trip for journalists, in the southern Amazonas state of Venezuela, just 19km (12 miles) from Brazil's border, September 7, 2012. The Venezuela government and indigenous groups are disputing whether an alleged massacre of Amazon villagers took place after the government said it found no evidence of an attack. A group representing the Yanomami tribe last week said that Brazilian gold miners had crossed the border and attacked a village from a helicopter. Venezuelan officials said over the weekend that flyovers of the area led them to believe that the allegations were false. Picture taken September 7, 2012. REUTERS/Carlos Garcia Rawlins (VENEZUELA - Tags: POLITICS SOCIETY)

A Yanomami Indian sits next to a fire at the community of Irotatheri, during a government trip for journalists, in the southern Amazonas state of Venezuela, just 19km (12 miles) from Brazil's border, September 7, 2012. The Venezuela government and indigenous groups are disputing whether an alleged massacre of Amazon villagers took place after the government said it found no evidence of an attack. A group representing the Yanomami tribe last week said that Brazilian gold miners had crossed the border and attacked a village from a helicopter. Venezuelan officials said over the weekend that flyovers of the area led them to believe that the allegations were false. Picture taken September 7, 2012. REUTERS/Carlos Garcia Rawlins (VENEZUELA - Tags: POLITICS SOCIETY)

Yanomami Indians sit around a fire at the community of Irotatheri, during a government trip for journalists, in the southern Amazonas state of Venezuela, just 19km (12 miles) from Brazil's border, September 7, 2012. The Venezuela government and indigenous groups are disputing whether an alleged massacre of Amazon villagers took place after the government said it found no evidence of an attack. A group representing the Yanomami tribe last week said that Brazilian gold miners had crossed the border and attacked a village from a helicopter. Venezuelan officials said over the weekend that flyovers of the area led them to believe that the allegations were false. Picture taken September 7, 2012. REUTERS/Carlos Garcia Rawlins (VENEZUELA - Tags: POLITICS SOCIETY)

A Yanomami Indian woman sleeps on a hammock at her shack at the community of Irotatheri, during a government trip for journalists, in the southern Amazonas state of Venezuela, just 19km (12 miles) from Brazil's border, September 7, 2012. The Venezuela government and indigenous groups are disputing whether an alleged massacre of Amazon villagers took place after the government said it found no evidence of an attack. A group representing the Yanomami tribe last week said that Brazilian gold miners had crossed the border and attacked a village from a helicopter. Venezuelan officials said over the weekend that flyovers of the area led them to believe that the allegations were false. Picture taken September 7, 2012. REUTERS/Carlos Garcia Rawlins (VENEZUELA - Tags: POLITICS SOCIETY)

A Yanomami Indian boy removes chiggers, the larvae of mites, from a fellow Yanomami at the community of Irotatheri, during a government trip for journalists, in the southern Amazonas state of Venezuela, just 19km (12 miles) from Brazil's border, September 7, 2012. The Venezuela government and indigenous groups are disputing whether an alleged massacre of Amazon villagers took place after the government said it found no evidence of an attack. A group representing the Yanomami tribe last week said that Brazilian gold miners had crossed the border and attacked a village from a helicopter. Venezuelan officials said over the weekend that flyovers of the area led them to believe that the allegations were false. Picture taken September 7, 2012. REUTERS/Carlos Garcia Rawlins (VENEZUELA - Tags: POLITICS SOCIETY)

A Yanomami Indian watches a dance as he chews leaves at the community of Irotatheri, during a government trip for journalists, in the southern Amazonas state of Venezuela, just 19km (12 miles) from Brazil's border, September 7, 2012. The Venezuela government and indigenous groups are disputing whether an alleged massacre of Amazon villagers took place after the government said it found no evidence of an attack. A group representing the Yanomami tribe last week said that Brazilian gold miners had crossed the border and attacked a village from a helicopter. Venezuelan officials said over the weekend that flyovers of the area led them to believe that the allegations were false. Picture taken September 7, 2012. REUTERS/Carlos Garcia Rawlins (VENEZUELA - Tags: POLITICS SOCIETY)

Yanomami Indians perform a dance at the community of Irotatheri, during a government trip for journalists, in the southern Amazonas state of Venezuela, just 19km (12 miles) from Brazil's border, September 7, 2012. The Venezuela government and indigenous groups are disputing whether an alleged massacre of Amazon villagers took place after the government said it found no evidence of an attack. A group representing the Yanomami tribe last week said that Brazilian gold miners had crossed the border and attacked a village from a helicopter. Venezuelan officials said over the weekend that flyovers of the area led them to believe that the allegations were false. Picture taken September 7, 2012. REUTERS/Carlos Garcia Rawlins (VENEZUELA - Tags: POLITICS SOCIETY)

A Yanomami Indian woman carries a child at the community of Irotatheri, during a government trip for journalists, in the southern Amazonas state of Venezuela, just 19km (12 miles) from Brazil's border, September 7, 2012. The Venezuela government and indigenous groups are disputing whether an alleged massacre of Amazon villagers took place after the government said it found no evidence of an attack. A group representing the Yanomami tribe last week said that Brazilian gold miners had crossed the border and attacked a village from a helicopter. Venezuelan officials said over the weekend that flyovers of the area led them to believe that the allegations were false. Picture taken September 7, 2012. REUTERS/Carlos Garcia Rawlins (VENEZUELA - Tags: POLITICS SOCIETY)

A Yanomami Indian runs in the jungle at the community of Irotatheri, during a government trip for journalists, in the southern Amazonas state of Venezuela, just 19km (12 miles) from Brazil's border, September 7, 2012. The Venezuela government and indigenous groups are disputing whether an alleged massacre of Amazon villagers took place after the government said it found no evidence of an attack. A group representing the Yanomami tribe last week said that Brazilian gold miners had crossed the border and attacked a village from a helicopter. Venezuelan officials said over the weekend that flyovers of the area led them to believe that the allegations were false. Picture taken September 7, 2012. REUTERS/Carlos Garcia Rawlins (VENEZUELA - Tags: POLITICS SOCIETY)

Yanomami Indians at the community of Irotatheri, are pictured during a government trip for journalists, as they wait to perform a dance to welcome an investigative commission, in the southern Amazonas state of Venezuela, just 19km (12 miles) from Brazil's border, September 7, 2012. The Venezuela government and indigenous groups are disputing whether an alleged massacre of Amazon villagers took place after the government said it found no evidence of an attack. A group representing the Yanomami tribe last week said that Brazilian gold miners had crossed the border and attacked a village from a helicopter. Venezuelan officials said over the weekend that flyovers of the area led them to believe that the allegations were false. Picture taken September 7, 2012. REUTERS/Carlos Garcia Rawlins (VENEZUELA - Tags: POLITICS SOCIETY)

An aerial view shows the Yanomami Indian community of Irotatheri, in the southern Amazonas state of Venezuela, just 19km (12 miles) from Brazil's border, during a government trip for journalists, September 7, 2012. The Venezuela government and indigenous groups are disputing whether an alleged massacre of Amazon villagers took place after the government said it found no evidence of an attack. A group representing the Yanomami tribe last week said that Brazilian gold miners had crossed the border and attacked a village from a helicopter. Venezuelan officials said over the weekend that flyovers of the area led them to believe that the allegations were false. Picture taken September 7, 2012. REUTERS/Carlos Garcia Rawlins (VENEZUELA - Tags: POLITICS SOCIETY)

An aerial view shows the Yanomami Indian community of Irotatheri, in the southern Amazonas state of Venezuela, just 19km (12 miles) from Brazil's border, during a government trip for journalists, September 7, 2012. The Venezuela government and indigenous groups are disputing whether an alleged massacre of Amazon villagers took place after the government said it found no evidence of an attack. A group representing the Yanomami tribe last week said that Brazilian gold miners had crossed the border and attacked a village from a helicopter. Venezuelan officials said over the weekend that flyovers of the area led them to believe that the allegations were false. Picture taken September 7, 2012. REUTERS/Carlos Garcia Rawlins (VENEZUELA - Tags: POLITICS SOCIETY)

A Yanomami Indian shack is pictured at night during a government trip for journalists at the community of Irotatheri, in the southern Amazonas state of Venezuela, just 19km (12 miles) from Brazil's border, September 7, 2012. The Venezuela government and indigenous groups are disputing whether an alleged massacre of Amazon villagers took place after the government said it found no evidence of an attack. A group representing the Yanomami tribe last week said that Brazilian gold miners had crossed the border and attacked a village from a helicopter. Venezuelan officials said over the weekend that flyovers of the area led them to believe that the allegations were false. Picture taken September 7, 2012. REUTERS/Carlos Garcia Rawlins (VENEZUELA - Tags: POLITICS SOCIETY TPX IMAGES OF THE DAY)

Afonso of the Yanomami tribe, who had a cancerous tumor removed by a medical expedition to the Cartucho community by the "Expedicionarios da Saude" (Brazilian Health Expeditions), smiles as he rests in Santa Isabel do Rio Negro in Amazonas state, northern Brazil, November 14, 2010. The "Expedicionarios da Saude" arranges two annual expeditions of volunteer doctors to set up a mobile hospital in the Amazon rainforest to give clinical and surgical attention to indigenous and local people. In the six days, the expedition assisted about 815 people and made around 160 surgeries, mainly cataracts and hernias, the most common diseases found within the local population. REUTERS/Ricardo Moraes (BRAZIL - Tags: SOCIETY HEALTH)

A man from a Yanomami tribe waits to be operated on by doctors from a "Expedicionarios da Saude" (Brazilian Health Expeditions) medical expedition to the Cartucho community in Santa Isabel do Rio Negro, in Amazonas state, northern Brazil, November 7, 2010. The organization carries out two annual expeditions to the Amazon Rainforest with voluntary doctors to provide clinical and surgical treatment for members of indigenous tribes and residents. REUTERS/Ricardo Moraes (BRAZIL - Tags: SOCIETY HEALTH) BEST QUALITY AVAILABLE

A doctor performs surgery on a man from the Yanomamy tribe at the Cartucho community during a medical expedition in Santa Izabel do Rio Negro, in Amazonas state in northern Brazil, November 8, 2010. The "Expedicionarios da Saude" (Brazilian Health Expeditions) is made up of volunteer doctors who set up a mobile hospital in the Amazon Rainforest twice a year to give clinical and surgical attention to indigenous and local people. REUTERS/Ricardo Moraes (BRAZIL - Tags: ENVIRONMENT SOCIETY HEALTH)

A woman from the Yanomamy tribe waits for medical attention at the Cartucho community during a medical expedition in Santa Izabel do Rio Negro, in Amazonas state in northern Brazil, November 8, 2010. The "Expedicionarios da Saude" (Brazilian Health Expeditions) is made up of volunteer doctors who set up a mobile hospital in the Amazon Rainforest twice a year to give clinical and surgical attention to indigenous and local people. REUTERS/Ricardo Moraes (BRAZIL - Tags: ENVIRONMENT SOCIETY HEALTH)

A man from the Yanomamy tribe leaves a mobile hospital area after receiving surgical treatment at the Cartucho community during a medical expedition in Santa Izabel do Rio Negro, in Amazonas state in northern Brazil, November 8, 2010. The "Expedicionarios da Saude" (Brazilian Health Expeditions) is made up of volunteer doctors who set up a mobile hospital in the Amazon Rainforest twice a year to give clinical and surgical attention to indigenous and local people. REUTERS/Ricardo Moraes (BRAZIL - Tags: ENVIRONMENT SOCIETY HEALTH)

A woman from the Yanomamy tribe wears sunglasses given by medics after receiving eye surgery at the Cartucho community during a medical expedition in Santa Izabel do Rio Negro, in Amazonas state in northern Brazil, November 8, 2010. The "Expedicionarios da Saude" (Brazilian Health Expeditions) is made up of volunteer doctors who set up a mobile hospital in the Amazon Rainforest twice a year to give clinical and surgical attention to indigenous and local people. REUTERS/Ricardo Moraes (BRAZIL - Tags: ENVIRONMENT SOCIETY HEALTH)