(CNN)– The Islamic State terror group has claimed to have beheaded American hostage Peter Kassig, an aid worker and former Army Ranger, in a graphic new video.
In the nearly 16-minute video uploaded to social networks on Sunday, a black-clad militant with his face concealed stands before a severed head that he claims is that of the U.S. aid worker.
The authenticity of the footage has not been verified.
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