Volunteers who have joined the Iraqi Army to fight against the predominantly Sunni militants, chant slogans in Baghdad
Volunteers who have joined the Iraqi Army to fight against the predominantly Sunni militants, who have taken over Mosul and other Northern provinces, chant slogans in Baghdad, June 14, 2014. Iraq's most senior Shi'ite Muslim cleric urged followers to take up arms against a full-blown Sunni militant insurgency to topple Shi'ite Prime Minister Nuri al-Maliki, escalating a conflict that threatens civil war and a possible break-up of the country. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS) MILITARY CONFLICT)
Volunteers who have joined the Iraqi Army to fight against the predominantly Sunni militants, board army trucks in Baghdad
Volunteers who have joined the Iraqi Army to fight against the predominantly Sunni militants, who have taken over Mosul and other Northern provinces, board army trucks in Baghdad, June 14, 2014. Iraq's most senior Shi'ite Muslim cleric urged followers to take up arms against a full-blown Sunni militant insurgency to topple Shi'ite Prime Minister Nuri al-Maliki, escalating a conflict that threatens civil war and a possible break-up of the country. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS) MILITARY CONFLICT)
Volunteers, who have joined the Iraqi army to fight against the predominantly Sunni militants from the radical Islamic State of Iraq and the Levant (ISIL) who have taken over Mosul and other northern provinces, prepare to board a bus in Baghdad
Volunteers who have joined the Iraqi army to fight against the predominantly Sunni militants from the radical Islamic State of Iraq and the Levant (ISIL) who have taken over Mosul and other northern provinces, prepare to board a bus in Baghdad, June 14, 2014. Iraq's most senior Shi'ite Muslim cleric urged followers to take up arms against a full-blown Sunni militant insurgency to topple Shi'ite Prime Minister Nuri al-Maliki, escalating a conflict that threatens civil war and a possible break-up of the country. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS) MILITARY CONFLICT)
Volunteers who have joined the Iraqi Army to fight against predominantly Sunni militants travel in army trucks in Baghdad
Volunteers who have joined the Iraqi Army to fight against predominantly Sunni militants who have taken over Mosul and other northern provinces, travel in army trucks in Baghdad June 14, 2014. Iraq's most influential Shi'ite cleric urged people on Friday to take up arms and defend the country against fighters from Islamic State in Iraq and the Levant (ISIL), who overran the city of Mosul earlier this week and have since advanced southwards. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY)
Volunteers who have joined the Iraqi Army to fight against the predominantly Sunni militants travel in army trucks in Baghdad
Volunteers, who have joined the Iraqi Army to fight against the predominantly Sunni militants who have taken over Mosul and other Northern provinces, travel in army trucks in Baghdad June 14, 2014. Iraqi Prime Minister Nuri al-Maliki told army officers in the city of Samarra that volunteers were arriving to help defeat Islamist militants who have swept through Sunni Muslim territory towards Baghdad. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY)
Volunteers who have joined the Iraqi Army to fight against the predominantly Sunni militants travel in army trucks in Baghdad
Volunteers, who have joined the Iraqi Army to fight against the predominantly Sunni militants who have taken over Mosul and other Northern provinces, travel in army trucks in Baghdad June 14, 2014. Iraqi Prime Minister Nuri al-Maliki told army officers in the city of Samarra that volunteers were arriving to help defeat Islamist militants who have swept through Sunni Muslim territory towards Baghdad. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY)
Volunteers who have joined the Iraqi Army to fight against the predominantly Sunni militants travel in army trucks in Baghdad
Volunteers, who have joined the Iraqi Army to fight against the predominantly Sunni militants who have taken over Mosul and other Northern provinces, travel in army trucks in Baghdad June 14, 2014. Iraqi Prime Minister Nuri al-Maliki told army officers in the city of Samarra that volunteers were arriving to help defeat Islamist militants who have swept through Sunni Muslim territory towards Baghdad. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY)
Volunteers who have joined the Iraqi Army to fight against the predominantly Sunni militants travel in army trucks in Baghdad
Volunteers, who have joined the Iraqi Army to fight against the predominantly Sunni militants who have taken over Mosul and other Northern provinces, travel in army trucks in Baghdad June 14, 2014. Iraqi Prime Minister Nuri al-Maliki told army officers in the city of Samarra that volunteers were arriving to help defeat Islamist militants who have swept through Sunni Muslim territory towards Baghdad. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY)
Volunteers who have joined the Iraqi Army to fight against the predominantly Sunni militants travel in army trucks in Baghdad
Volunteers, who have joined the Iraqi Army to fight against the predominantly Sunni militants who have taken over Mosul and other Northern provinces, travel in army trucks in Baghdad June 14, 2014. Iraqi Prime Minister Nuri al-Maliki told army officers in the city of Samarra that volunteers were arriving to help defeat Islamist militants who have swept through Sunni Muslim territory towards Baghdad. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY)
Volunteers who have joined the Iraqi Army to fight against the predominantly Sunni militants travel in army trucks in Baghdad
Volunteers, who have joined the Iraqi Army to fight against the predominantly Sunni militants who have taken over Mosul and other Northern provinces, travel in army trucks in Baghdad June 14, 2014. Iraqi Prime Minister Nuri al-Maliki told army officers in the city of Samarra that volunteers were arriving to help defeat Islamist militants who have swept through Sunni Muslim territory towards Baghdad. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY)