A masked man stands next to a kneeling man identified as U.S. citizen Peter Edward Kassig (L), in this still image taken from video released by Islamic State militants fighting in Iraq and Syria, on October 3, 2014. U.S. officials confirmed that an American named Kassig was being held by the militants and said they had no reason to doubt the authenticity of the video. The video also purported to show the beheading of British citizen Alan Henning, who had been abducted in northwest Syria in December 2013, the fourth such killing of a Westerner by Islamic State, which has seized large swaths of Iraq and Syria and has been blamed for a wave of sectarian violence. REUTERS/Social Media Website via Reuters TV (UNKNOWN – Tags: CIVIL UNREST CRIME LAW CONFLICT POLITICS) ATTENTION EDITORS – THIS PICTURE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THE AUTHENTICITY, CONTENT, LOCATION OR DATE OF THIS IMAGE. NO SALES. NO ARCHIVES. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS PICTURE IS DISTRIBUTED EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS
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