A chilling video that appears to show a boy executing an alleged Iraqi spy has been released by the Islamic State.

Slickly edited footage shows the teenager, of Western appearance, loading a 9mm handgun as the prisoner is driven into a warehouse by a group of masked militants.

The boy, believed to be around 14 years old, forces him to kneel on the ground and removes his blindfold before making a statement in Arabic vowing to avenge the U.S., Russia and Europe.

He then crouches next to the victim, raises his gun to his head and appears to shoot him three or four times. The victim collapses to ground in a pool of blood.

The next Jihadi John? A teenage boy loads a 9mm handgun before appearing to shoot dead an alleged spy in the latest execution video released by the Islamic State terror group

Sinister: A group of masked militants line up behind the prisoner, who is accused of spying for the Iraqi army

But the boy is never seen in the same frame when the fatal shots are fired, raising suspicions the video has been carefully edited to make it appear as if he was the executioner when in fact the gun was fired by an adult.

Similar tactics are believed to have been employed by the terror group in a video earlier this year when a boy of similar age appeared to execute an suspected Israeli spy.

Experts had questioned whether the boy, thought to be about ten, was really the person who pulled the trigger, supposedly murdering Muhammad Said Ismail Musallam with a single gunshot.

It also raises the disturbing possibility that young boys are increasingly being groomed to become the next generation of Jihadi Johns, the British ISIS fighter charged with carrying out the most high-profile executions for the terror group.

Boy 'executioner': The child, believed to be around 14 years old, forces the prisoner to kneel on the ground and removes his blindfold before making a statement in Arabic vowing to avenge the U.S., Russia and Europe

Sick: The boy crouches next to the victim and raises his gun to the prisoner's head as the militants look on

The latest video bears all the hallmarks of the skillfully edited and highly choreographed videos released by the jihadi group's Al Hayat media centre, most notably in the sickening footage showing the Jordanian pilot being burned to death in February.

It begins with Hollywood-style graphics similar to those used in 1999 science fiction film The Matrix.

As streams of computer code run down one side of the screen, the prisoner is seen apparently being interrogated by his captors.

According to anti-ISIS activist Abu Mohammed, who shared images from the video on Twitter, the victim is accused of spying on for the Iraqi army by passing information about the location of ISIS fighters.

The boy is never seen in the same frame when the fatal shots are fired, raising suspicions the video has been carefully edited to make it appear as if he was the executioner when in fact the gun was fired by an adult

Mr Mohammed, who risks his life leaking information from inside the ISIS stronghold of Raqqa, says the alleged spy is forced to 'announce his remorse and ask his collaborators to abandon the failed government and join the Islamic State'.

The video, believed to have been taken in Iraq, then cuts to a warehouse, where the boy, dressed in black with an ISIS logo on his chest, selects a handgun from a table and loads it with ammunition.

Two cars drive in and masked militants armed with automatic weapons drag the blindfolded prisoner, dressed in an orange jumpsuit, from the back of one of the saloons.