In a chilling new video released by the ISIS, five shackled prisoners, alleged "British spies," are shown kneeling in front of a masked gunman speaking in a British accent, calling David Cameron an "imbecile" while a young child with a British accent points out where the executions will take place. "We will kill the kuffar [non believers] over there," says the child, according to the Express.

The gunman makes a long statement directed to the British PM and the United Kingdom, saying, "This is a message to David Cameron. Oh slave of the White House, oh mule of the Jews. How strange it is that we find ourselves today hearing an insignificant leader like you challenge the might of the Islamic State. How strange it is that the leader of a small island threatens us with a handful of planes. One would have thought you would have learned the lessons of your pathetic master in Washington and his failed campaign against Islamic State."

"It seems that you, just like your predecessors Blair and Brown, are just as arrogant and foolish. In fact David, you are more of an imbecile. Only an imbecile would dare to wage war against a land where the law of Allah reigns supreme. And where the people live under the justice and security of the Sharia," he continues.

"Only an imbecile would dare to anger a people who love death the way that you love your life. Oh British Government. Oh people of Britain. Know that today your citizenship are under our feet. And that the Islamic State, our country, is here to stay. And we will continue to wage jihad, break borders and one day invade your land where we will rule by the sharia," says the masked executioner, who is being called the "New Jihadi John," reports Heavy.

The militant rants for some more time, concluding by saying, "You will lose this war, as you lost in Iraq and Afghanistan. But this time, when you lose, your children will inherit your defeat and remember you as the fools who thought they could fight the Islamic State," reports Independent.

The video has been released in the aftermath of reports of a British unmanned Reaper drone killing a number of ISIS extremists on Dec. 25. The drone strike was authorised after Cameron won a vote to allow the bombing campaign to be extended from Iraq into Syria to target the ISIS.

"We are aware of the video and are studying its contents," said a Foreign Office spokesman, according to The Mirror.

Meanwhile, the young boy has been identified as the son of jihadi bride Grace "Khadija" Dare from Lewisham, Southeast London. The confirmation was given to The Telegraph by Henry Dare, Khadija's father. "I was surprised when I saw the picture. It's definitely him. Of course I'm worried but there's nothing I can do now. I'm not angry - I would never have expected it. I just hope someone is trying to bring them back," said Dare, a minicab driver, reports The Telegraph.