Inside look at U.S.-led coalition's deadliest single attack on ISIL

The initial reports coming into Baghdad’s operations center seemed implausible: A convoy of dozens of Islamic State vehicles were preparing to flee advancing Iraqi forces in Fallujah. A surveillance drone dispatched to the area confirmed the reports. Staff officers gathered around screens and stared incredulously as the numbers of vehicles continued to expand, the militants apparently oblivious to the target they presented from the air.

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