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A masked Islamic State militant holding a knife speaks next to man purported to be U.S. journalist James Foley at an unknown location in this still image from an undated video posted on a social media website. (Credit: Reuters via Reuters TV)

A masked Islamic State militant holding a knife speaks next to man purported to be U.S. journalist James Foley at an unknown location in this still image from an undated video posted on a social media website. (Credit: Reuters via Reuters TV)