An off-duty Shi'ite volunteer from brigades loyal to radical cleric Muqtada al-Sadr takes up position with his weapon on a vehicle while returning home, in Samarra, July 13, 2014. Followers of al-Sadr, who fought U.S. troops under the banner of the Mehdi Army during the 2003-2011 occupation, have returned as Sadr's new "Peace Brigades." The black-turbaned cleric was shown on television this week surrounded by aides in camouflage poring over maps of deployments around Samarra. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS CONFLICT) 

Off-duty Shi'ite volunteers from brigades loyal to radical cleric Muqtada al-Sadr, ride a vehicle as they return home, in Samarra, July 13, 2014. Followers of al-Sadr, who fought U.S. troops under the banner of the Mehdi Army during the 2003-2011 occupation, have returned as Sadr's new "Peace Brigades." The black-turbaned cleric was shown on television this week surrounded by aides in camouflage poring over maps of deployments around Samarra. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS CONFLICT) 

Off-duty Shi'ite volunteers from brigades loyal to radical cleric Muqtada al-Sadr take a ride to return home, in Samarra July 13, 2014. Followers of radical cleric Muqtada al-Sadr, who fought U.S. troops under the banner of the Mehdi Army during the 2003-2011 occupation, have returned as Sadr's new "Peace Brigades". REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS) 

Off-duty Shi'ite volunteers from brigades loyal to radical cleric Muqtada al-Sadr, ride a vehicle as they return home, in Samarra, July 13, 2014. Followers of al-Sadr, who fought U.S. troops under the banner of the Mehdi Army during the 2003-2011 occupation, have returned as Sadr's new "Peace Brigades." The black-turbaned cleric was shown on television this week surrounded by aides in camouflage poring over maps of deployments around Samarra. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS CONFLICT) 

Off-duty Shi'ite volunteers from brigades loyal to radical cleric Muqtada al-Sadr, ride a vehicle as they return to home, in Samarra, July 13, 2014. Followers of al-Sadr, who fought U.S. troops under the banner of the Mehdi Army during the 2003-2011 occupation, have returned as Sadr's new "Peace Brigades." The black-turbaned cleric was shown on television this week surrounded by aides in camouflage poring over maps of deployments around Samarra. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS CONFLICT) 

A Shi'ite volunteer from brigades loyal to radical cleric Muqtada al-Sadr, keeps guard as he mans a machine gun in front of a picture of Iraqi Shi'ite radical leader Muqtada al-Sadr, in Samarra July 13, 2014. Followers of radical cleric Muqtada al-Sadr, who fought U.S. troops under the banner of the Mehdi Army during the 2003-2011 occupation, have returned as Sadr's new "Peace Brigades." The black-turbaned cleric was shown on television this week surrounded by aides in camouflage poring over maps of deployments around Samarra. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS CONFLICT) 

Off-duty Shi'ite volunteers from brigades loyal to radical cleric Muqtada al-Sadr, ride a vehicle as they return home in Samarra July 13, 2014. Followers of radical cleric Muqtada al-Sadr, who fought U.S. troops under the banner of the Mehdi Army during the 2003-2011 occupation, have returned as Sadr's new "Peace Brigades". REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS) 

A Shi'ite volunteer from brigades loyal to radical cleric Muqtada al-Sadr, keeps guard as he mans a machine gun in front of a picture of Iraqi Shi'ite radical leader Muqtada al-Sadr (L) and the Grand Ayatollah Mohammed Sadiq al-Sadr, in Samarra, July 13, 2014. Followers of radical cleric Muqtada al-Sadr, who fought U.S. troops under the banner of the Mehdi Army during the 2003-2011 occupation, have returned as Sadr's new "Peace Brigades." The black-turbaned cleric was shown on television this week surrounded by aides in camouflage poring over maps of deployments around Samarra. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS CONFLICT) 

Burnt vehicles belonging to the Iraqi security forces are seen on a road leading to Samarra at Salahuddin province July 12, 2014. Followers of radical cleric Muqtada al-Sadr, who fought U.S. troops under the banner of the Mehdi Army during the 2003-2011 occupation, have returned as Sadr's new "Peace Brigades." The black-turbaned cleric was shown on television this week surrounded by aides in camouflage poring over maps of deployments around Samarra. Picture taken July 12, 2014. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS) 

Burnt vehicles belonging to the Iraqi security forces are seen on a road leading to Samarra at Salahuddin province July 12, 2014. Followers of radical cleric Muqtada al-Sadr, who fought U.S. troops under the banner of the Mehdi Army during the 2003-2011 occupation, have returned as Sadr's new "Peace Brigades." The black-turbaned cleric was shown on television this week surrounded by aides in camouflage poring over maps of deployments around Samarra. Picture taken July 12, 2014. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS) 

Burnt vehicles belonging to the Iraqi security forces are seen on a road leading to Samarra at Salahuddin province July 12, 2014. Followers of radical cleric Muqtada al-Sadr, who fought U.S. troops under the banner of the Mehdi Army during the 2003-2011 occupation, have returned as Sadr's new "Peace Brigades." The black-turbaned cleric was shown on television this week surrounded by aides in camouflage poring over maps of deployments around Samarra. Picture taken July 12, 2014. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS) 

A burnt vehicle belonging to the Iraqi security forces is seen on a road leading to Samarra at Salahuddin province July 12, 2014. Followers of radical cleric Muqtada al-Sadr, who fought U.S. troops under the banner of the Mehdi Army during the 2003-2011 occupation, have returned as Sadr's new "Peace Brigades." The black-turbaned cleric was shown on television this week surrounded by aides in camouflage poring over maps of deployments around Samarra. Picture taken July 12, 2014. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS) 

Armed Shi'ite volunteers from brigades loyal to radical cleric Muqtada al-Sadr, take their positions during a military advance in areas under the control of militants of the Islamic State, formerly known as the Islamic State in Iraq and the Levant (ISIL), on the outskirts of Samarra July 12, 2014. Followers of al-Sadr, who fought U.S. troops under the banner of the Mehdi Army during the 2003-2011 occupation, have returned as Sadr's new "Peace Brigades." The black-turbaned cleric was shown on television this week surrounded by aides in camouflage poring over maps of deployments around Samarra. Picture taken July 12, 2014. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS) 

Armed Shi'ite volunteers from brigades loyal to radical cleric Muqtada al-Sadr, take their positions during a military advance in areas under the control of militants of the Islamic State, formerly known as the Islamic State in Iraq and the Levant (ISIL), on the outskirts of Samarra July 12, 2014. Followers of al-Sadr, who fought U.S. troops under the banner of the Mehdi Army during the 2003-2011 occupation, have returned as Sadr's new "Peace Brigades." The black-turbaned cleric was shown on television this week surrounded by aides in camouflage poring over maps of deployments around Samarra. Picture taken July 12, 2014. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS) 

Armed Shi'ite volunteers from brigades loyal to radical cleric Muqtada al-Sadr, take their positions during a military advance in areas under the control of militants of the Islamic State, formerly known as the Islamic State in Iraq and the Levant (ISIL), on the outskirts of Samarra July 12, 2014. Followers of al-Sadr, who fought U.S. troops under the banner of the Mehdi Army during the 2003-2011 occupation, have returned as Sadr's new "Peace Brigades." The black-turbaned cleric was shown on television this week surrounded by aides in camouflage poring over maps of deployments around Samarra. Picture taken July 12, 2014. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS) 

Armed Shi'ite volunteers from brigades loyal to radical cleric Muqtada al-Sadr, take their positions during a military advance in areas under the control of militants of the Islamic State, formerly known as the Islamic State in Iraq and the Levant (ISIL), on the outskirts of Samarra July 12, 2014. Followers of al-Sadr, who fought U.S. troops under the banner of the Mehdi Army during the 2003-2011 occupation, have returned as Sadr's new "Peace Brigades." The black-turbaned cleric was shown on television this week surrounded by aides in camouflage poring over maps of deployments around Samarra. Picture taken July 12, 2014. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS) 

Armed Shi'ite volunteers from brigades loyal to radical cleric Muqtada al-Sadr, take their positions during a military advance in areas under the control of militants of the Islamic State, formerly known as the Islamic State in Iraq and the Levant (ISIL), on the outskirts of Samarra July 12, 2014. Followers of al-Sadr, who fought U.S. troops under the banner of the Mehdi Army during the 2003-2011 occupation, have returned as Sadr's new "Peace Brigades." The black-turbaned cleric was shown on television this week surrounded by aides in camouflage poring over maps of deployments around Samarra. Picture taken July 12, 2014. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS) 

An armed Shi'ite volunteer from brigades loyal to radical cleric Muqtada al-Sadr, takes his position during a military advance in areas under the control of militants of the Islamic State, formerly known as the Islamic State in Iraq and the Levant (ISIL), on the outskirts of Samarra July 12, 2014. Followers of al-Sadr, who fought U.S. troops under the banner of the Mehdi Army during the 2003-2011 occupation, have returned as Sadr's new "Peace Brigades." The black-turbaned cleric was shown on television this week surrounded by aides in camouflage poring over maps of deployments around Samarra. Picture taken July 12, 2014. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS) 

An armed Shi'ite volunteer from the brigades of radical cleric Muqtada al-Sadr, takes his position during a military advance in areas under the control of militants of the Islamic State, formerly known as the Islamic State in Iraq and the Levant (ISIL), on the outskirts of Samarra July 12, 2014. Followers of al-Sadr, who fought U.S. troops under the banner of the Mehdi Army during the 2003-2011 occupation, have returned as Sadr's new "Peace Brigades." The black-turbaned cleric was shown on television this week surrounded by aides in camouflage poring over maps of deployments around Samarra. Picture taken July 12, 2014. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS) 

Members of Shi'ite group Asaib Ahl al-Haq carry coffins of fighters from their group who were killed during clashes with militants of the Islamic State, formerly known as the Islamic State of Iraq and the Levant (ISIL), during a funeral in Najaf July 7, 2014. Iraq's new parliament put off its next session for five weeks on Monday, extending the country's political paralysis amid a Sunni Islamist insurgency which claimed the life of an army general near Baghdad. Citing the politicians' failure to reach "understanding and agreement" on nominations for the top three posts in government, the office of acting speaker Mehdi al-Hafidh said parliament would not meet again until August 12. REUTERS/Alaa Al-Marjani (IRAQ - Tags: CIVIL UNREST POLITICS OBITUARY) 

Members of Shi'ite group Asaib Ahl al-Haq carry coffins of fighters from their group who were killed during clashes with militants of the Islamic State, formerly known as the Islamic State of Iraq and the Levant (ISIL), during a funeral in Najaf July 7, 2014. Iraq's new parliament put off its next session for five weeks on Monday, extending the country's political paralysis amid a Sunni Islamist insurgency which claimed the life of an army general near Baghdad. Citing the politicians' failure to reach "understanding and agreement" on nominations for the top three posts in government, the office of acting speaker Mehdi al-Hafidh said parliament would not meet again until August 12. REUTERS/Alaa Al-Marjani (IRAQ - Tags: CIVIL UNREST POLITICS OBITUARY) 

Members of Shi'ite group Asaib Ahl al-Haq carry coffins of fighters from their group who were killed during clashes with militants of the Islamic State, formerly known as the Islamic State of Iraq and the Levant (ISIL), during a funeral in Najaf July 7, 2014. Iraq's new parliament put off its next session for five weeks on Monday, extending the country's political paralysis amid a Sunni Islamist insurgency which claimed the life of an army general near Baghdad. Citing the politicians' failure to reach "understanding and agreement" on nominations for the top three posts in government, the office of acting speaker Mehdi al-Hafidh said parliament would not meet again until August 12. REUTERS/Alaa Al-Marjani (IRAQ - Tags: CIVIL UNREST POLITICS OBITUARY) 

A top leader of the Mehdi Army using the nom de guerre Abu Deraa (C) stands during a parade in Baghdad's Sadr city, June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Wissm al-Okili(IRAQ - Tags: CIVIL UNREST MILITARY POLITICS RELIGION) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr take part during a parade in Baghdad's Sadr city, June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Wissm al-Okili (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY RELIGION) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr march during a parade in Baghdad's Sadr city, June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Wissm al-Okili (IRAQ - Tags: CIVIL UNREST POLITICS) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr take part during a parade in Baghdad's Sadr city, June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Wissm al-Okili (IRAQ - Tags: CIVIL UNREST POLITICS) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr march during a parade in Baghdad's Sadr city, June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Wissm al-Okili (IRAQ - Tags: CIVIL UNREST POLITICS) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr participate in a parade in Baghdad's Sadr city, June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Wissm al-Okili (IRAQ - Tags: CIVIL UNREST POLITICS) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr march during a parade in Baghdad's Sadr city, June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Wissm al-Okili (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr take part in a parade in Baghdad's Sadr city June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Ahmed Saad (IRAQ - Tags: CIVIL UNREST MILITARY POLITICS) 

Mehdi Army Army women loyal to Shi'ite cleric Moqtada al-Sadr take part during a parade in Baghdad's Sadr city June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Ahmed Saad (IRAQ - Tags: CIVIL UNREST MILITARY POLITICS) 

A member from the Mehdi Army stands guard during a parade in Baghdad's Sadr city June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Ahmed Saad (IRAQ - Tags: CIVIL UNREST MILITARY POLITICS) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr take part in a parade in Baghdad's Sadr city June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Ahmed Saad (IRAQ - Tags: CIVIL UNREST MILITARY POLITICS) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr take part during a parade in Baghdad's Sadr city June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Ahmed Saad (IRAQ - Tags: CIVIL UNREST MILITARY POLITICS) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr take part during a parade in Baghdad's Sadr city June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Ahmed Saad (IRAQ - Tags: CIVIL UNREST MILITARY POLITICS) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr take part during a parade in Baghdad's Sadr city June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Ahmed Saad (IRAQ - Tags: CIVIL UNREST MILITARY POLITICS) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr burn a U.S. flag during a parade in Baghdad's Sadr city, June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Wissm al-Okili (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr march during a parade in Baghdad's Sadr city, June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Wissm al-Okili (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr march during a parade in Baghdad's Sadr city, June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Wissm al-Okili (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr take part during a parade in Baghdad's Sadr city June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Ahmed Saad (IRAQ - Tags: CIVIL UNREST MILITARY POLITICS) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr burn a U.S. flag during a parade in Baghdad's Sadr city, June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Wissm al-Okili (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr march during a parade in Najaf, June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Alaa Al-Marjani (IRAQ - Tags: CIVIL UNREST MILITARY POLITICS RELIGION) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr march during a parade in Najaf, June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Alaa Al-Marjani (IRAQ - Tags: CIVIL UNREST MILITARY POLITICS RELIGION) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr march during a parade in Najaf, June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Alaa Al-Marjani (IRAQ - Tags: CIVIL UNREST MILITARY POLITICS RELIGION) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr march during a parade in Najaf, June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Alaa Al-Marjani (IRAQ - Tags: CIVIL UNREST MILITARY POLITICS RELIGION) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr march during a parade in Najaf, June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Alaa Al-Marjani (IRAQ - Tags: CIVIL UNREST MILITARY POLITICS RELIGION) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr march during a parade in Najaf, June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Alaa Al-Marjani (IRAQ - Tags: CIVIL UNREST MILITARY POLITICS RELIGION) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr march during a parade in Najaf, June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Alaa Al-Marjani (IRAQ - Tags: CIVIL UNREST MILITARY POLITICS RELIGION) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr march during a parade in Najaf, June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Alaa Al-Marjani (IRAQ - Tags: CIVIL UNREST MILITARY POLITICS RELIGION) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr march during a parade in Najaf, June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Alaa Al-Marjani (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr march during a parade in Najaf, June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Alaa Al-Marjani (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr march during a parade in Najaf, June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Alaa Al-Marjani (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr take part in a parade in Baghdad's Sadr city June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Ahmed Saad (IRAQ - Tags: CIVIL UNREST MILITARY POLITICS) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr take part in a parade in Baghdad's Sadr city June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Ahmed Saad (IRAQ - Tags: CIVIL UNREST MILITARY POLITICS) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr take part in a parade in Baghdad's Sadr city June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Ahmed Saad (IRAQ - Tags: CIVIL UNREST MILITARY POLITICS) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr take part in a parade in Baghdad's Sadr city June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Ahmed Saad (IRAQ - Tags: CIVIL UNREST MILITARY POLITICS) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr take part in a parade in Baghdad's Sadr city June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Ahmed Saad (IRAQ - Tags: CIVIL UNREST MILITARY POLITICS) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr take part in a parade in Baghdad's Sadr city June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Ahmed Saad (IRAQ - Tags: CIVIL UNREST MILITARY POLITICS) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr take part in a parade in Baghdad's Sadr city June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Ahmed Saad (IRAQ - Tags: CIVIL UNREST MILITARY POLITICS RELIGION) 

Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr take part in a parade in Baghdad's Sadr city June 21, 2014. Iraq's senior Shi'ite religious cleric Moqtada al-Sadr issued a call for unity, saying Shi'ites and Sunnis should rally behind the authorities to prevent the Sunni militant Islamic State of Iraq and the Levant from destroying the country. REUTERS/Ahmed Saad (IRAQ - Tags: CIVIL UNREST MILITARY POLITICS RELIGION)