Latest News Wires ISIS claims to have beheaded U.S. aid worker Kassig

Western leaders are expressing outrage after Islamic State militants released a video claiming to have killed Peter Kassig, an aid worker in Syria who was formerly a U.S. soldier. Addressing Obama, a man threatens to "slaughter your people in your streets."

By , Reuters

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Islamic State militants said in a video on Sunday they had beheaded U.S. hostage Peter Kassig and warned the United States they would kill other U.S. citizens "on your streets."