Islamic State militants on Sunday released yet another video that appears to show the murder of an American hostage.
The clip shows a masked man with a decapitated head covered in blood... which he says is Peter Kassig.
Kassig, a former soldier,... was captured by militants in Syria last year in October... while working for charity groups in Lebanon and Syria.
The video also shows several other men being beheaded.
The U.S. says it′s working to determine the authenticity of the video.
British Prime Minister David Cameron said he was "horrified by the cold-blooded murder,"... adding that Britain′s Foreign Office was analyzing the video.

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