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In this file still image posted on a militant Twitter account on Wednesday, June 11, 2014, which has been authenticated based on its contents and other AP reporting, militants parade down a main road in Mosul, Iraq. Days after Iraqís second-largest city fell to al-Qaida-inspired fighters, some Iraqis are already returning to Mosul, lured back by insurgents offering cheap gas and food, restoring power and water and removing traffic barricades. (AP Photo/militant source via Twitter, File) ( Mideast Iraq Returning to Mosul )

This image posted on a militant news Twitter account on Thursday, June 12, 2014 shows militants from the al-Qaida-inspired Islamic State of Iraq and the Levant (ISIL) removing part of the soil barrier on the Iraq-Syria borders and moving through it. Days after Iraqís second-largest city fell to al-Qaida-inspired fighters, some Iraqis are already returning to Mosul, lured back by insurgents offering cheap gas and food, restoring power and water and removing traffic barricades. (AP Photo/albaraka_news, FIle) ( Mideast Iraq Returning to Mosul )

An image uploaded on June 14, 2014 on the jihadist website Welayat Salahuddin allegedly shows militants of the Islamic State of Iraq and the Levant (ISIL) riding in a captured vehicle left behind by Iraqi security forces at an unknown location in the Salaheddin province. A major offensive spearheaded by ISIL but also involving supporters of executed dictator Saddam Hussein has overrun all of one province and chunks of three others since it was launched on June 9. AFP PHOTO / HO / WELAYAT SALAHUDDIN === RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / HO / WELAYAT SALAHUDDIN" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS FROM ALTERNATIVE SOURCES, AFP IS NOT RESPONSIBLE FOR ANY DIGITAL ALTERATIONS TO THE PICTURE'S EDITORIAL CONTENT, DATE AND LOCATION WHICH CANNOT BE INDEPENDENTLY VERIFIED ===-/AFP/Getty Images ( 530736893 )

This file image posted on a militant news Twitter account on Thursday, June 12, 2014 shows militants from the al-Qaida-inspired Islamic State of Iraq and the Levant (ISIL) people raising their flag at the entrance of an army base in Ninevah Province. Iraq. Days after Iraqís second-largest city fell to al-Qaida-inspired fighters, some Iraqis are already returning to Mosul, lured back by insurgents offering cheap gas and food, restoring power and water and removing traffic barricades. (AP Photo/albaraka_news, File) ( Mideast Iraq Returning to Mosul )

This image posted on a militant website on Saturday, June 14, 2014, which has been verified and is consistent with other AP reporting, appears to show militants from the al-Qaida-inspired Islamic State of Iraq and the Levant (ISIL) with captured Iraqi soldiers wearing plain clothes after taking over a base in Tikrit, Iraq. The Islamic militant group that seized much of northern Iraq has posted photos that appear to show its fighters shooting dead dozens of captured Iraqi soldiers in a province north of the capital Baghdad. Iraq's top military spokesman Lt. Gen. Qassim al-Moussawi confirmed the photos’ authenticity on Sunday and said he was aware of cases of mass murder of Iraqi soldiers. (AP Photo via militant website) ( Mideast Iraq )

This image posted on a militant website on Saturday, June 14, 2014, which has been verified and is consistent with other AP reporting, appears to show militants from the al-Qaida-inspired Islamic State of Iraq and the Levant (ISIL) leading away captured Iraqi soldiers in plain clothes after taking over a base in Tikrit, Iraq. The Islamic militant group that seized much of northern Iraq has posted photos that appear to show its fighters shooting dead dozens of captured Iraqi soldiers in a province north of the capital Baghdad. Iraq's top military spokesman Lt. Gen. Qassim al-Moussawi confirmed the photosí authenticity on Sunday and said he was aware of cases of mass murder of Iraqi soldiers. (AP Photo via militant website) ( Mideast Iraq )

This image posted on a militant website on Saturday, June 14, 2014, which has been verified and is consistent with other AP reporting, appears to show militants from the al-Qaida-inspired Islamic State of Iraq and the Levant (ISIL) leading captured Iraqi soldiers wearing plain clothes to an open field moments before shooting them in Tikrit, Iraq. The Islamic militant group that seized much of northern Iraq has posted photos that appear to show its fighters shooting dead dozens of captured Iraqi soldiers in a province north of the capital Baghdad. Iraq's top military spokesman Lt. Gen. Qassim al-Moussawi confirmed the photosí authenticity on Sunday and said he was aware of cases of mass murder of Iraqi soldiers. (AP Photo via militant website) ( Mideast Iraq )

An image uploaded on June 14, 2014 on the jihadist website Welayat Salahuddin allegedly shows militants of the Islamic State of Iraq and the Levant (ISIL) executing dozens of captured Iraqi security forces members at an unknown location in the Salaheddin province. A major offensive spearheaded by ISIL but also involving supporters of executed dictator Saddam Hussein has overrun all of one province and chunks of three others since it was launched on June 9. AFP PHOTO / HO / WELAYAT SALAHUDDIN ( 530736613 )

This image posted on a militant website on Saturday, June 14, 2014, which has been verified and is consistent with other AP reporting, appears to show militants from the al-Qaida-inspired Islamic State of Iraq and the Levant (ISIL) taking aim at captured Iraqi soldiers wearing plain clothes after taking over a base in Tikrit, Iraq. The Islamic militant group that seized much of northern Iraq has posted photos that appear to show its fighters shooting dead dozens of captured Iraqi soldiers in a province north of the capital Baghdad. Iraq's top military spokesman Lt. Gen. Qassim al-Moussawi confirmed the photos’ authenticity on Sunday and said he was aware of cases of mass murder of Iraqi soldiers. (AP Photo via militant website) ( Mideast Iraq )

Iraqi civilians volunteering to fight a militant offensive gather themselves together on June 15, 2014, in the southern port city of Basra before going to Iraqi second city Mosul. Leading Shiite cleric Grand Ayatollah Ali al-Sistani urged Iraqis on June 13 to take up arms against Sunni militants marching on Baghdad, as thousands volunteered to bolster the capital's defences. AFP PHOTO/ STR-/AFP/Getty Images ( 530739205 )

An Iraqi civilian, volunteering to fight a militant offensive, kisses a Koran book as he queues with comrades before boarding buses to reach Mosul on June 15, 2014, in the southern port city of Basra. Leading Shiite cleric Grand Ayatollah Ali al-Sistani urged Iraqis on June 13 to take up arms against Sunni militants marching on Baghdad, as thousands volunteered to bolster the capital's defences. AFP PHOTO/ STR-/AFP/Getty Images ( 530739201 )

Shiite tribal fighters raise their weapons and chant slogans against the al-Qaida-inspired Islamic State of Iraq and the Levant (ISIL) in the east Baghdad neighborhood of Kamaliya, Iraq, Sunday, June 15, 2014. Emboldened by a call to arms by the top Shiite cleric, Iranian-backed militias have moved quickly to the center of Iraqís political landscape, spearheading what its Shiite majority sees as a fight for survival against Sunni militants who control of large swaths of territory north of Baghdad. (AP Photo) ( Mideast Iraq Shiite Militias )

Shiite tribal fighters raise their weapons and chant slogans against the al-Qaida-inspired Islamic State of Iraq and the Levant (ISIL) in Basra, Iraq's second-largest city, 340 miles (550 kilometers) southeast of Baghdad, Iraq, Sunday, June 15, 2014. Emboldened by a call to arms by the top Shiite cleric, Iranian-backed militias have moved quickly to the center of Iraqís political landscape, spearheading what its Shiite majority sees as a fight for survival against Sunni militants who control of large swaths of territory north of Baghdad. (AP Photo/ Nabil Al-Jurani) ( Mideast Iraq Shiite Militias )

Iraqi volunteers to fight along side the Iraqi security forces against Jihadist militants, flah the sign of victory as they leave a recruitment center aboard military trucks on June 15, 2014 in the Iraqi capital Baghdad. Faced with a militant offensive sweeping south toward Baghdad, Prime Minister Nuri al-Maliki announced the Iraqi government would arm and equip civilians who volunteer to fight, and thousands have signed up. AFP PHOTO/AHMAD AL-RUBAYE ( 530736349 )

Iraqi men carry their weapons as they volunteer to fight along side the Iraqi security forces against Jihadist militants who have taken over several northern Iraqi cities, on June 15 2014, in the capital Baghdad. Faced with a militant offensive sweeping south toward Baghdad, Prime Minister Nuri al-Maliki announced the Iraqi government would arm and equip civilians who volunteer to fight, and thousands have signed up. AFP PHOTO/AHMAD AL-RUBAYE ( 530743569 )

Iraqi volunteers to fight along side the Iraqi security forces against Jihadist militants, flah the sign of victory as they leave a recruitment center aboard military trucks on June 15, 2014 in the Iraqi capital Baghdad. Faced with a militant offensive sweeping south toward Baghdad, Prime Minister Nuri al-Maliki announced the Iraqi government would arm and equip civilians who volunteer to fight, and thousands have signed up. AFP PHOTO/AHMAD AL-RUBAYE ( 530739212 )