(CNN) -- Iraqi cities seem to be falling with relative ease, unaided by a military that has bolted and a militant group bent on continuing its march forward.
Mosul, Iraq's second-largest city, is already in the control of the Islamic State in Iraq and Syria. Much of Tikrit is as well. And on Thursday, an audio recording purportedly from the Islamist militants threatened a takeover of more, including the capital Baghdad.
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