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A picture taken with a mobile phone shows an armoured vehicle belonging to Iraqi security forces in flames on June 10, 2014, after hundreds of militants from the Islamic State of Iraq and the Levant (ISIL) launched a major assault on the security forces in Mosul, some 370 kms north from the Iraqi capital Baghdad. Some 500,000 Iraqis have fled their homes in Iraq's second city Mosul after Jihadist militants took control, fearing increased violence, the International Organization for Migration said. AFP PHOTO/STR (Photo credit should read STR/AFP/Getty Images)
A picture taken with a mobile phone shows an armoured vehicle belonging to Iraqi security forces in flames on June 10, 2014, after hundreds of militants from the Islamic State of Iraq and the Levant (ISIL) launched a major assault on the security forces in Mosul, some 370 kms north from the Iraqi capital Baghdad. Some 500,000 Iraqis have fled their homes in Iraq's second city Mosul after Jihadist militants took control, fearing increased violence, the International Organization for Migration said. AFP PHOTO/STR (Photo credit should read STR/AFP/Getty Images)

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Official: Iraq's swift decline surprising

Military source tells CNN's Kyra Phillips they were surprised by how fast Iraqi cities were overrun by ISIS forces.

Official: Iraq's swift decline surprising

Military source tells CNN's Kyra Phillips they were surprised by how fast Iraqi cities were overrun by ISIS forces.