CAIRO (AP) — An Internet video released Friday purports to show an Islamic State group fighter beheading British hostage Alan Henning, the fourth such killing carried out by the extremist group now targeted in U.S.-led airstrikes.

The video mirrored other beheading videos shot by the Islamic State group, which now holds territory along the border of Syria and Iraq, and ended with a militant threatening a man they identified as an American named Peter Kassig.

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