An Internet video purports to show an Islamic State group fighter beheading British hostage Alan Henning.

The video was released Friday night. It mirrored other beheading videos shot by the Islamic State group, which now holds territory along the border of Syria and Iraq.

The video ended with an Islamic State fighter threatening a man they identified as an American.

The Associated Press could not immediately verify the video's authenticity, though it was released in the same manner as other Islamic State group videos.