An Internet video released Friday purportedly shows an Islamic State fighter beheading captured British aid worker Alan Henning and threatening another American captive in the fourth such killing carried out by the extremist group, according to The Associated Press.

The video mirrored other beheading videos shot by the Islamic State group, which now holds territory along the border of Syria and Iraq. It ended with an Islamic State fighter threatening a man they identified as an American named Peter Kassig.

via Video purportedly shows ISIS beheading of British hostage Alan Henning | Fox News.