A NEW video from the Islamic State claims to show the beheading of a third prisoner — British man David Haines — and threatens America’s allies for supporting action in the Middle East.

The video appears intended as a direct threat to British Prime Minister David Cameron:

“For being a lapdog, Cameron, you will drag your people into another bloody and unwinnable war,” the video warns.

“This British man has to pay the price for your promise, Cameron, to arm the Peshmerga against the Islamic State.”

David Haines is also shown reciting an Islamic State script.

“You followed Americans into Iraq, following the trend of British Prime Ministers who cannot find the courage to say no to Americans,” he appears to say

“Unfortunately, it is we the British public, that in the end that will pay the price for our parliaments selfish decisions.”

The executioner, speaking with a British accent, repeats previous threats, stating the United States must end its air strikes against jihadists in Iraq.

“This British man has to pay the price for your promise, Cameron,” he says. “Ironically, he has spent a decade of his life serving under the same Royal Air Force that is responsible for delivering those arms. Your evil alliance with America which continues to strike the Muslims of Iraq and most recently bombed the Haditha Dam will only accelerate your destruction.”

The video closes with yet another threat, this time to the life of alleged British captive Alan Henning. He is understood to be an aid worker.

Why are European Muslims the cuntiest of all?

They're not polite and understanding like American Muslims at all. Our Muslim population is generally made up of pretty decent families who came here for a better life.

And unlike Muslims from trashcanistan, they don't have the excuse of being dirt poor or uneducated.