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American journalist Steven Sotloff has been beheaded by Muslim extremist group ISIS, also referred to as ISIL.
A video has been released which appears to show Sotloff being beheaded.
Sotloff disappeared in Syria in August 2013 while on assignment.
The White House said it has not authenticated the video.
Last month, the same group released video of the beheading of American journalist James Foley.