Iraqi Shiite men shout slogans in support for the call to arms in Baghdad's Sadr city
Iraqi Shiite men shout slogans in support for the call to arms in Baghdad's Sadr city, June 14, 2014. Grand Ayatollah Ali al-Sistani 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 CONFLICT MILITARY)
Iraqi Shiite men shout slogans in support for the call to arms in Iraq, in Baghdad's Sadr city
Iraqi Shiite men shout slogans in support for the call to arms in Iraq, in Baghdad's Sadr city, June 14, 2014. Grand Ayatollah Ali al-Sistani 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)
Iraqi Shiite men shout slogans in support for the call to arms in Baghdad's Sadr city
Iraqi Shiite men shout slogans in support for the call to arms in Baghdad's Sadr city, June 14, 2014. Grand Ayatollah Ali al-Sistani 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)
Iraqi Shiite men shout slogans in support for the call to arms in Baghdad's Sadr city
Iraqi Shiite men shout slogans in support for the call to arms in Baghdad's Sadr city, June 14, 2014. Iraqi Shiite men shout slogans in support for the call to arms in Baghdad's Sadr city. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY CONFLICT)
Iraqi Shiite men shout slogans in support for the call to arms in Baghdad's Sadr city
Iraqi Shiite men shout slogans in support for the call to arms in Baghdad's Sadr city, June 14, 2014. Grand Ayatollah Ali al-Sistani 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 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. In a rare intervention at Friday prayers in the holy city of Kerbala, a message from Grand Ayatollah Ali al-Sistani, who is the highest religious authority for Shi'ites in Iraq, said people should unite to fight back against a lightning advance by militants from the radical Islamic State of Iraq and the Levant. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY CONFLICT)
Iraqi Shiite men shout slogans in support for the call to arms by Grand Ayatollah Ali al-Sistani in Baghdad
Iraqi Shi'ite men shout slogans in support for the call to arms by Grand Ayatollah Ali al-Sistani, who is the highest religious authority for Shi'ites in Iraq, in Baghdad's Sadr city, June 14, 2014. Grand Ayatollah Ali al-Sistani 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)
Iraqi Shiite men shout slogans in support for the call to arms by Grand Ayatollah Ali al-Sistani, who is the highest religious authority for Shi'ites in Iraq, in Baghdad
Iraqi Shi'ite men shout slogans in support for the call to arms by Grand Ayatollah Ali al-Sistani, who is the highest religious authority for Shi'ites in Iraq, in Baghdad's Sadr city, June 14, 2014. Grand Ayatollah Ali al-Sistani 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 from the Shi'ite Badr Organization chant slogans in Basra
Volunteers from the Shi'ite Badr Organization, 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, chant slogans in Basra 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/ Essam Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY)
Volunteers, who have joined the Iraqi Army to fight against predominantly Sunni militants chant slogans in Baghdad
Volunteers, who have joined the Iraqi Army to fight against predominantly Sunni militants who have taken over Mosul and other northern provinces, chant slogans 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)