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The latest sickening video released by ISIS shows the moment a man is executed with an explosive necklace.

In the horrifying footage, the man - alleged to be an Iraqi spy - is seen kneeling on the ground wearing what appears to be a wire and bomb around his neck.

The explosives are then detonated, killing the victim in scenes far too horrific to show.

The terror group's media outlets frequently releases savage execution videos in an attempt to strike fear into the heart of its enemies.

Middle East analysts say Islamic State has stepped up its propaganda campaign in recent months because it has made major territorial losses in both Iraq and Syria as it battles rival groups, the Syrian and Iraqi armies, Kurd warriors and the Free Syrian Army.

Russian and US-led coalition airstrikes on the jihadis' oil production operation are also believed to have crippled their finances. There have also been reports of mass defections by jaded ISIS fighters.

Other parts of the video - titled 'Where to Flee' in what appears to be a threat to potential deserters - claim to show police officers being shot as well as the beheading of a second 'spy'.

Earlier this month, another propaganda video was alleged released by Islamic State showing the moment a gay man was thrown off a roof of a building.

As he plunges to his death, a group of men waiting on the ground run towards his body and pelt it with stones.

Read more:ISIS militants CRUCIFY 4 men before shooting them dead on busy street

The clip also shows ISIS militants destroying piles of Christian relics and tearing the cross down from the top of a church.