ISIL release beheading video of aid worker

The Islamic State of Iraq and Levant (ISIL) released a video Friday purportedly depicting the beheading of British aid worker Alan Henning and threatening to kill another American captive

The video mirrored others released by the extremist group, which holds territory — and is now being targeted by a U.S.-led coalition — along the border of Syria and Iraq.

In the clip, Henning, a 47-year-old Syrian aid convoy volunteer, is shown allegedy being killed by a masked man in a desert location.

Titled “Another Message to America and its Allies,” the video has the aid worker saying "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."

It ends with the ISIL fighter threatening to kill 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 others from the group and the masked militant sounded similar to the one who carried out the other slayings.

Britain said late Friday that if the video showing the beheading of British citizen Alan Henning is genuine, then it was a disgusting murder.

“We are aware of the video and are working urgently to verify the contents,” a spokesman for the British Foreign Office said.

But British Prime Minister David Cameron appeared to confirm that beheading.

“The brutal murder of Alan Henning by ISIL shows just how barbaric these terrorists are. My thoughts are with his wife and their children,” he said in a message from his Twitter account.

It is the fourth such video released by ISIL in recent weeks, and has similar traits to the others. The full beheadings are not shown in the clips, but the British-accented, English-speaking ISIL member holds a long knife and appears to begin cutting the head’s of the three men. Previous victims were American reporters James Foley and Steven Sotloff and British aid worker David Haines.

Henning, 47, nicknamed "Gadget," had joined an aid convoy and was taken captive on Dec. 26, shortly after crossing the border between Turkey and Syria. Earlier this week, Henning's wife Barbara Henning asked the extremist group in a televised plea: "Please release him. We need him back home."

Dozens of Muslim leaders in Britain have urged his captors to release Alan Henning. His wife had said she had been given hope by "the outcry across the world" over her husband's imprisonment.

Al Jazeera and wire services