A shocking video has emerged showing 18 prisoners in orange jumpsuits getting shot in the back of the head from point-blank range in summary executions in Libya. The men understood to be ISIS fighters, are shown kneeling in four rows and facing away from their killers.

Executioners can be seen walking up slowly behind their targets before firing a spray of bullets from what looks like semi-automatic assault rifles into the backs of their heads before another line of killers repeat the sequence.

It comes amid tensions between jihadists and Libyan forces in Benghazi after strongman Khalifa Haftar – a former soldier under the Gaddafi regime who has risen through the ranks to commander of the Libyan National Army – declared victory in the eastern city.

The gruesome video, seen by MailOnline, shows all 18 men in orange jumpsuits falling to the floor after being shot, but it it not clear who is pulling the trigger and giving the orders. It is claimed by the Libyan Express the commander of the eastern Saiqa Force of Operation Dignity Mahmoud Al-Werfalli conducted the massacre.

He was also said to have ordered the killings by the Libyan Observer, who reported he had been promoted by Haftar, leader of the Libyan National Army, for his alleged role in killing policemen in May.

It is understood those killed were ISIS fighters in Libya, according to Al Jazeera, who again claimed it was Al-Werfalli reading the charges before his proteges shoot the detainees dead.

In the video, a man can be seen reading from a piece of paper and men in military uniform can be seen walking up to their targets, taking one each, and unleashing a flurry of bullets on the command of their leader. The kneeling men fall to the ground face-first, which doesn’t stop the gunmen from shooting.

Eventually, they turn on their heels and walk back together in a line before a new set of executioners walk forward and kill the next line of prisoners.  A man in an orange jumpsuit located in the second line appears to fall forward in an attempt to fool the executioners, but he is dragged back onto his knees and callously shot in the head in the second round of killings.

The sequence continues until all 18 men are dead.