Islamic militants have released a video which claims to show the beheading of Steven Sotloff, a US journalist kidnapped in Syria last year.
If corroborated it would be the second murder of a US journalist by the Islamic State of Iraq and the Levant, known as Isis, in just under two weeks.
Mr Sotloff, who freelanced for Time and Foreign Policy magazines, was shown kneeling against a desert backdrop with a masked man standing over him brandishing a knife.
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