Islamic State militants said in a video November 16, 2014 they had beheaded U.S. hostage aid worker Kassig and warned the United States they would kill other U.S. citizens.
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    Obama: US aid worker Peter Kassig's beheading by Islamic State group 'pure evil'

    Mr Peter Kassig in front of a truck somewhere along the Syrian border between late 2012 and autumn 2013 as Special Emergency Response and Assistance was delivering supplies to refugees.
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    ISIS claims it beheaded US aid worker and 18 Syrians