A sneak attack on the Kurdish capital of Kirkuk Friday, believed to have been launched by an ISIS sleeper cell, is stoking fears that more jihadists are lying in wait amid a vast sea of refugees in northern Iraq. ISIS RETREAT REVEALS EXTENSIVE TUNNEL SYSTEMRelated Image Expand / Contract Kurdish forces keep watch atop buildings following the sleeper cell attack. (FoxNews.com)Located about 100 miles southeast of ISIS’ stronghold of Mosul, Kirkuk is the heart of the semi-autonomous Kurdish territory. Arab villages inside Kirkuk include ISIS supporters who helped - and then harbored - the killers. With most of the Kurdish forces in Mosul, the attack showed the vulnerability of the Kurdish capital.

Source: Fox News October 21, 2016 21:22 UTC