A suspected British boy has threatened the UK with new terror attacks in a depraved ISIS execution video in which five spies are killed.
Dressed in military fatigues and a black bandanna bearing the white flag of ISIS [Daesh], he pointed to the distance and declared: 'We will kill kuffar [non believers] over there.'
In the ten minute long propaganda video, five shackled men, dressed in orange jumpsuits, were filmed 'confessing' to spying for British security services.
One of the masked executioners, who spoke in a clear British accent, threatened David Cameron before executing the unarmed men.
In the 10 minute long video, the five captives were forced to confess to their crimes - most probably under duress - before they were paraded to a remote desert location and ordered to kneel.
The English speaking jihadi then yelled 'Allahu Akbar' before he and his fellow fanatics shot the men in the back of their heads from point blank range.
The video ended with a trailer for another execution, in which a young, dark skinned boy threatened Britain, raising fears the child may have executed someone on camera.
Before killing the prisoners in cold blood, the British jihadi said: 'This is a message to David Cameron, slave of the White House, mule of the Jews.'
He called the Prime Minister an 'imbecile' and claimed 'your children will pay' for British airstrikes on ISIS targets in Syria.
He added: '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 [Tony] Blair and [Gordon] Brown, are just as arrogant and foolish.
'David, only a fool would 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.
'As for those of you who wish to continue fighting under the banner of Cameron on the minimum wage, we say to you, to ask yourself, do you really think your government will care about you when you come into our hands?
'Or will they abandon you, as they have abandoned these spies, and those who came before them.'
The executioner, who waves his handgun at the camera before killing one of the prisoners in cold blood, bore a chilling resemblance to ISIS's former executioner in chief, Jihadi John.
The fanatic, real name Mohammed Emwazi, was filmed executing British aid workers David Haines and Alan Henning, American journalists Steven Sotloff and James Foley, American aid worker Peter Kassig and Japanese journalist Kenji Goto.
He was killed by a US drone strike near an iconic clock tower in the terror group's de facto capital of Raqqa in Syria in November.
The new video, which features a child threatening Britain, comes a month since RAF jets began bombing ISIS targets in Syria.
In the wake of the Paris attacks and a UN Security Council resolution which called on all member states to double their efforts to eradicate ISIS, British Typhoon and Tornado jets began airstrikes on Syria.
RAF strikes killed 396 ISIS terrorists from October 2014 to October 2015, with 30 wiped out in a single strike in November, a Freedom of Information request revealed.
And on December 9, Chancellor George Osborne said 16 RAF jets had killed four since MPs voted to extend strikes to Syria a week prior.
In another propaganda video released last month, a Russian speaking ISIS fighter threatened President Vladimir Putin before he beheaded a suspected spy on camera.
The jihadi vowed revenge on Putin in response to Russian jets which had been targetting ISIS and rebel fighters in aid of President Bashar al-Assad.
The executioner, who was later named as Anatoly Zemlyanka, 28, said to Russia: 'You will not find peace in your homes.
'We will kill your sons... for each son you killed here. And we will destroy your homes for each home you destroyed here.'
By Jay Akbar and Isabel Hunter
Warning: Graphic content...
© Associated Newspapers Ltd.