Shi'ite volunteer from brigades loyal to radical cleric Muqtada al-Sadr, keeps guard as he mans a machine gun in Samarra
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
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
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
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
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 al-Sadr, take their positions during a military advance in areas on the outskirts of Samarra
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 al-Sadr, take their positions during a military advance in areas on the outskirts of Samarra
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 al-Sadr, take their positions during a military advance in areas on the outskirts of Samarra
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 al-Sadr, take their positions during a military advance in areas on the outskirts of Samarra
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 al-Sadr, take their positions during a military advance in areas on the outskirts of Samarra
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)