Tribal fighters shout slogans while holding weapons in Basra
Tribal fighters shout slogans while holding weapons in Basra, southeast of Baghdad June 18, 2014. Iraq has asked the United States for air support in countering Sunni rebels, the top U.S. general said on Wednesday, after the militants seized major cities in a lightning advance that has routed the Shi'ite-led government's army. REUTERS/ Essam Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS)
A Mehdi Army fighter demonstrates during a military-style training in Baghdad
A Mehdi Army fighter loyal to Shi'ite cleric Moqtada al-Sadr demonstrates during a military-style training in Baghdad, June 18, 2014. Iraq has asked the United States for air support in countering Sunni rebels, the top U.S. general said on Wednesday, after the militants seized major cities in a lightning advance that has routed the Shi'ite-led government's army. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY CONFLICT)
Mehdi Army fighters take part in a military-style training in Baghdad
Mehdi Army fighters loyal to Shi'ite cleric Moqtada al-Sadr take part in a military-style training in Baghdad, June 18, 2014. Iraq has asked the United States for air support in countering Sunni rebels, the top U.S. general said on Wednesday, after the militants seized major cities in a lightning advance that has routed the Shi'ite-led government's army. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY CONFLICT)
A member of the Iraqi Special Operations Forces stands guard during an intensive security deployment in Baghdad
A member of the Iraqi Special Operations Forces stands guard during an intensive security deployment in Baghdad's Amiriya district, June 18, 2014. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY)
Members of the Iraqi Special Operations Forces stand guard during an intensive security deployment in Baghdad
Members of the Iraqi Special Operations Forces stand guard during an intensive security deployment in Baghdad's Amiriya district, June 18, 2014. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY)
Members of the Iraqi Special Operations Forces stand guard during an intensive security deployment in Baghdad
Members of the Iraqi Special Operations Forces stand guard during an intensive security deployment in Baghdad's Amiriya district, June 18, 2014. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY)
A member of the Iraqi Special Operations Forces stands guard during an intensive security deployment in Baghdad
A member of the Iraqi Special Operations Forces stands guard during an intensive security deployment in Baghdad's Amiriya district, June 18, 2014. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY)
Members of the Iraqi Special Operations Forces stand guard during an intensive security deployment in Baghdad
Members of the Iraqi Special Operations Forces stand guard during an intensive security deployment in Baghdad's Amiriya district, June 18, 2014. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY)
A member of the Iraqi Special Operations Forces stands guard during an intensive security deployment in Baghdad
A member of the Iraqi Special Operations Forces stands guard during an intensive security deployment in Baghdad's Amiriya district, June 18, 2014. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY)
Members of the Iraqi Special Operations Forces stand guard during an intensive security deployment in Baghdad
Members of the Iraqi Special Operations Forces stand guard during an intensive security deployment in Baghdad's Amiriya district, June 18, 2014. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS MILITARY) CONFLICT)