This latest graphic and shocking footage has all the militants' trademark slick production effects and features a light-skinned executioner dressed in similar costume to the now infamous 'Jihadi John'.

The prisoner, believed to be a Syrian soldier captured by ISIS, is forced to wear the same kind of orange jumpsuit worn by Western hostages before they are savagely beheaded by the terror group.

The killer is seen ranting in Arabic behind the doomed prisoner before the HD footage is edited into slow-motion and the militant is seen catching the shotgun, thrown to him by somebody off camera.

Seconds later he fires a single round into the back of the victim's head causing horrific injuries far too graphic to publish. The film rewinds and replays the moment of impact in gruesome detail several times, before cutting to a shot of a pool of blood and the prisoner's dead body.

In the film the unidentified killer wears the now familiar uniform of the Islamic State executioner - a black robe, a black balaclava to mask his identity and a brown leather gunbelt.

But in a departure from the terror group's notorious beheading videos, this latest execution is carried out with a pump-action shotgun - a weapon more often associated with gangland killings in the U.S. and Britain than jihadis.

The film begins with the captured soldier - understood to be a member of Bashar Al-Assad's Syrian Arab Army - wearing a military combat uniform as he is made to read a statement to the camera.

He is then seen having his hands tied behind his back being marched to an area of scrubland behind a stone wall beneath a hill.

Islamic music - known as a nasheed - accompanies the video as the prisoner appears resigned to his inevitable grisly fate.

After being led to the courtyard the prisoner is forced to kneel in front of the executioner while he issues what appears to be be the customary warning to the enemies of the Islamic State.

When he finally finishes ranting the killer raises the shotgun and fires a single round into the back of the man's head, causing him to slump forwards, face-down in the dirt.

The video finishes with a graphic slow-motion playback of the blasting of the shotgun into the man's head, as well as gruesome close up shots of his dead body.

The shotgun method of execution marks a departure from the now familiar beheadings witnessed in previous videos but the impact is no less graphic.

(dailymail.co.uk)