In this file image made from a video released Sunday, Feb. 15, 2015, by militants in Libya claiming loyalty to the Islamic State group purportedly shows Egyptian Coptic Christians in orange jumpsuits being led along a beach, each accompanied by a masked militant. The mass beheadings of Egyptian Christians by militants in Libya linked to the Islamic State group have thrown a spotlight on the threat the extremists pose beyond their heartland in Syria and Iraq, where they have established a self-declared proto-state. (AP Photo, File)
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