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(Image: IS)

The video allegedly shows the children of foreign fighters as they hold pistols to the back of the heads of captured Kurdish fighters.The boy second from right appears to be white, no more than 11-years-old, and is reportedly from Britain.

Site Intel Group identified the lad and claimed the other four are Egyptian, Kurdish, Tunisian and Uzbek.

(Image: IS) (Image: IS)

During the clip – which is believed to have been filmed in Raqqa – the five young fighters make statements in Arabic.

They then place handguns to the backs of the captured Kurds heads before pulling the trigger.

The alleged British boy's weapon appears to jam and the youngster smiles before the video cuts a disturbing close up of the execution.

In the video, the boy is dubbed Abu Abdullah Al-Britani.

The moniker is similar to other notorious British jihadis, including Kent mum-of-two Sally Jones who went by Umm Hussain al Britani.

She fled to Syria in 2013 with 10-year-old son Jojo.

A report on terrorism by Europol identified approximately 50 Brit children living with ISIS in the war-torn region.

ISIS notoriously has a dedicated wing for childrem known as the Caliphate Cubs – images of which showed jihadi juniors flaunting weapons likes toys.

Earlier this year a young jihadi was killed when he was playing with a hand grenade after being taken by his mother from Sweden.

The clip is featured in a nine minute propaganda pacakge which also includes graphic imagery of destroyed buildings, dead bodies and a montage of past executions.

The shocking video comes as ISIS faces being battled back in Syria and Iraq.

Turkey launched an offensive in northern Syria earlier this week, while Iraqi army forces bear down in the cult near the captured city of Mosul.