The child, who is not even old enough to start school, then appears to smile as he use the deadly weapon to hack the head off of his cuddly toy.

In new footage which has emerged - believed to have been released by ISIS but its provenance unconfirmed - the boy then lifts his knife triumphantly into the air and a man behind the camera shouts 'takfir!' - a derogatory word used to describe non-believers. 

The latest disturbing footage - thought to have been released by the terror group but unconfirmed - shows the child blurred out as he walks into a bedroom dressed in black with a beige hat on.

He comes into focus when he appears to grab the white and red teddy bear's head and thrusts the knife into its neck.

He uses the blade to hack away at the teddy during the 30-second clip, uploaded onto YouTube.

Then, smiling as if he was playing with the toy, the child raises the weapon into the air - seemingly copying the gesture carried out by Islamic State executioner, Jihadi John.

The boy's clothes also resemble those of Mohammed Emwazi, who has been responsible for the murders of at least five western hostages since he beheaded American journalist James Foley in August 2014.

When an unidentified man behind the camera shouts the word 'takfir', the boy once again appears to attack his cuddly toy.

The amateur video is not as professionally produced as previous ISIS footage. It has been released on social media reporting to have been made by ISIS, although MailOnline has not been able to confirm its provenance or veracity.

The disturbing video has sparked outrage online. A Syrian man on Twitter described it as 'a perfect symbolisation of a destroyed childhood'.

Julie Lenarz of the Human Security Centre think-tank called it 'child abuse of the most wicked sort' -while several suggested he was being 'brainwashed' into carrying out beheadings when he grows up.

Counter-terrorism experts have told MailOnline that ISIS mould young children into killers by hijacking their education - and minds - from a very early age.

It has released videos of young boys learning how to use deadly automatic rifles and being taught Islamic State's twisted ideology in schools run by the terror group.

ISIS has reprogrammed their young and impressionable minds into those of killers by, according to the executive director of the Investigative Project on Terrorism.

Steve Emerson told MailOnline: 'Indoctrinating kids with ISIS fanaticism is not only the easiest population to indoctrinate but also produces new generations of ISIS believers and... at some point fighters.'

'Their goal is to rebuild the Islamic societies they have conquered into a global comprehensive Islamist system that... takes over all aspects of society from garbage collection to teaching at the Madrassats [religious schools].' 

In July, a small child was filmed beheading a human victim in the first ISIS  video of its kind.  

It is thought he killed the unnamed Syrian soldier in Homs province of Syria after the man was captured at nearby army checkpoint 

The victim was thought to be stationed in the ancient city of Palmyra, where ISIS have destroyed another priceless monument today. 

That video was also shared by ISIS soldiers who praised the young boy, thought to be no older than 10, for executing an enemy fighter.  

The regime soldier was forced onto his stomach as the young boy approached him from behind, pulled his head back and used the knife to decapitate him.

(dailymail.co.uk)