Video claims to show ISIS fighter beheading hostage Alan Henning

WATCH ABOVE: ISIS released a video of what is believed to be Alan Henning’s execution by beheading, threatening to kill U.S. aid worker Peter Kassig (pictured above) next. Aarti Pole reports.

ISIS appears to have beheaded British volunteer Alan Henning, despite desperate pleas from his family and Muslim leaders.

The video, which appeared online Friday, follows the similar pattern of previous video ISIS, also referred to as the Islamic State group, has released of its horrific killings of Western captives — forcing the victims to make declarations damning foreign governments for attacking the militant group.

YouTube removed the video a short time after it was posted.

READ MORE: Wife of Islamic State hostage makes televised appeal for his release

Henning, kneeling before a masked, knife-wielding militant, delivered a message blaming the British government for his murder.

“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,” Henning said to the camera in the moments before a knife is taken to his neck.

The masked militant, whom U.S. authorities say they know the identity of, said that British Prime Minister David Cameron had the “blood of David Haines” on his hands, referring to the British aid worker ISIS murdered in September. The video of Haines’ murder appeared online on Sept. 14, at which time Henning’s life was threatened.

The British parliament approved air strikes by Royal Air Force bombers last week. British jets began bombing ISIS targets in Iraq on Tuesday.

READ MORE: Why captured British journalist delivers ISIS message in latest video

As with earlier ISIS killings, the video ended with a warning that another captive would be killed.

This time, a man identified as American Peter Edward Kassig was held before the screen as U.S. President Barack Obama was warned he would be responsible for the death of another U.S. citizen.

“You have started your aerial bombardment in Sham (Syria), which keeps on striking our people. So it’s only right we continue to strike the next of your people.”

Henning, 47, was a taxi driver in the U.K. before joining a Muslim aid group called Al-Faitha Global. He was kidnapped on Dec. 26 while crossing from Turkey into Syria in a convoy.

The series of beheading videos began in August, when ISIS posted online footage of the murder of James Foley — a U.S. freelance journalist who held captive for nearly two years. As warned in that video, the extremists executed another U.S. journalist, Steven Sotloff, and posted the video of his murder online on Sept. 2. His death was followed by Haines in mid-September.

An ISIS-linked group in Algeria also beheaded 55-year-old French traveller Herve Gourdel, in response to France carrying out airstrikes as a part of the U.S.-led coalition against ISIS.