The Islamic State group released a video purporting to show the beheading of British aid worker Alan Henning Friday. This is the fourth video that ISIS militants have released that shows the execution of a Western hostage.

The video opens with a clip from a Russia Today newscast reporting that the U.K. Parliament voted to join the U.S.-led coalition and strike Iraq. British Parliament voted to authorize airstrikes on militant strongholds in Iraq last week. The first Royal Air Force jet bombed Iraq on Saturday.

The screen then goes black and the words “another message to America and its allies” appear in white letters.

The video then shows the executioner and Henning, whose hands are tied behind his back. The ISIS militant appears to be the same man in the beheading videos of James Foley, Steven Sotloff and David Haines; he is clad in black and speaks in English with a London accent.

Henning appears kneeling in an orange jumpsuit similar to the ones worn by Guantanamo Bay prisoners. Henning is wearing a microphone.

“Because of our parliament’s decision to attack the Islamic state, I, as a member of the British public, will now pay the price,” Henning says.

The executor says that the blood of his previous victim, David Haines, was on the hands of British Prime Minister David Cameron. Henning’s blood, he says, is on the hands of the U.K. Parliament.

Following the pattern of past videos, the militant threatens another hostage, who appears next to him, also clad in orange. The executioner then addresses President Barack Obama and warns that American aid worker and former Army Ranger Peter Edward Kassig will be next if the U.S. does not stop its operations on ISIS strongholds in Iraq and Syria.

"Obama you have started your aerial bombardment in Sham [Syria], which keeps on striking our people," the militant said. "So it's only right that we continue to strike the necks of your people."