New ISIS video claims beheading of American hostage Peter Kassig

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.

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The authenticity of the footage has not been verified. National Security Council spokesperson Bernadette Meehan said in a statement that intelligence officials were "working as quickly as possible to determine its authenticity.
"If confirmed, we are appalled by the brutal murder of an innocent American aid worker and we express our deepest condolences to his family and friends," Meehan said. The video was posted shortly after President Obama departed for Washington from the G-20 summit in Australia.
A government official confirmed to Fox News that the National Counterterrorism Center is aware of the video and is reviewing the tape.

New ISIS video claims beheading of American hostage Peter Kassig