Another internet video released by ISIS purportedly shows the beheading of British hostage, Alan Henning. An ISIS militant was shown next to Alan Henning in the video showing the beheading of David Haines, indicating he was ISIS' next target.

In this video, the ISIS militant states, "The blood of David Haines was on your hands, Cameron. Daniel Henning will also be slaughtered. But his blood is on the hands of the British Parliament."

Before his gruesome death, Henning made this statement, "Hi I'm Alan Henning. Because of our parliament's decision to attack the Islamic State, I as a member of the British public, will now pay the price for that decision."

Barbara Henning, Alan's wife, had previously petitioned ISIS to release her husband. In response, ISIS reportedly sent Barbara video and audio messages of Alan pleading for his life.

ISIS has stated it will continue to target every "western" citizen it can due to current war against ISIS. The radical terrorist group promises to behead former US Army Ranger Peter Kassig next.

This marks the fourth time ISIS has released beheading videos of western Citizens (2 American, 2 British). ISIS has also beheaded David Haines, James Foley, and Steven Sotloff.

Read more about ISIS here and here.