Depraved ISIS brutes stab, shoot and crucify prisoners in a horrific new video that also shows children and pensioners carrying out executions.

A vile compilation of killings, filmed in the terror group's caliphate across Syria and Iraq, shows men being blindfolded and strung up on crosses in town squares.

One victim, bound by metal restrainers, can be seen being knifed in the chest by a masked jihadist, while a second man is shot in the head at close range by another barbarian.

The sickening video also includes footage of children and even pensioners shooting prisoners in the back of the head.

It is not clear when the footage was taken, although it is thought some of the material was taken from previous execution films.

The video emerged after separate footage showed an alleged 'spy' being blown to pieces with an artillery gun near the Euphrates river.

ISIS fanatics show the horrifying moment of impact in slow motion during a propaganda video, which also features two beheadings.

In a film called 'Allah will be sufficient for you against them 2', the man is paraded in an orange jump suit while armed extremists dressed in black stand guard.

Sickening footage then shows his body being torn apart by the impact of a heavy round.

ISIS seized swathes of Syria and Iraq in 2014, but has since been pushed back by armed groups including Kurdish fighters as well as Iraqi and Syrian government forces.

Iraqi forces fought their way into Mosul yesterday as moves to reclaim the ISIS stronghold continued to gather pace.