ISIS Claims Beheading of Steven Sotloff

The video allegedly showed 31-year-old freelance writer Steven Sotloff on his knees beside an ISISI fighter with a knife.

The Islamic State of Iraq and Syria (ISIS) released a video on Tuesday showing a masked militant beheading a second American journalist, according to the private terrorism monitoring group SITE.

The White House said that it had yet to authenticate the footage, which SITE said showed 31-year-old freelance writer Steven Sotloff on his knees beside an ISISI fighter with a knife.