ISIS propaganda chiefs used a chest-mounted camera to capture a video game-style first person view of the execution of two crucified men.

The sickening images, released by ISIS media arm Wilayat ar-Raqqah, show a pair of men tied to a cross being shot in the head with a pistol in front of a large crowd of men, women and children.

The killers claimed the blindfolded men were spies operating against the Islamic State.

Warning signs are then hung on the men's corpses as a final indignity, reports terror analysts SITE .

The terror group frequently uses chest-mounted camera footage of the battlefield in its propaganda to appeal to potential young recruits raised on hit first person shooter games like Call of Duty and Medal of Honor.

One of the 'spies' is crucified and shot in the head
A crowd watched the vile execution

Yesterday Paris attacks suspect Salah Abdeslam's lawyer Sven Mary called him a "perfect example of the Grand Theft Auto generation", adding he is a "petty thief" who has "the intelligence of an empty ashtray".

Islamic State often subjects captives to horrific and elaborate execution methods - and films them as part of their sickening propaganda campaign.

A screenshot from Call of Duty - Black Ops 2

Their savage methods include drowning men in a cage in a swimming pool, strapping explosives to the heads of kneeling men connected by wires and burning hostages alive in cages.

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.