The barbaric footage is believed to have been filmed in the terror group's de facto capital Raqqa and bears all the chilling hallmarks of ISIS' professionally produced and edited propaganda films.

The gruesome killing of three Syrian soldiers is just the latest in a long line of horrific filmed murders released by the Sunni Islamists since last summer's self-declaration of a caliphate in the vast areas of Syria and Iraq they control through a campaign of rape, massacre and brutal oppression.

ISIS' latest shocking murder video begins by showing hundreds of baying, bloodthirsty supporters of the terror group gathering in central Raqqa where a bearded cleric is seen breathlessly reading out charges against three Syrian soldiers dressed in military fatigues.

Laughing children are seen clambering on walls and on to the shoulders of their grinning fathers to get a better view of proceedings, while a large group of niqab-wearing women gather nearby.

The three prisoners are seen on their knees in the centre of a circle of the militants, who link arms to hold back the throng of young men intent on taking part in the savage triple murder.

The footage is edited so the cleric's feverish Arabic ranting reverberates and echoes as the crowd of young, T-shirt and baseball cap-wearing supporters push and shove to get closer to the victims.

Seconds later the crowd is unleashed on the men, surging forward and raining down kicks, punches and beatings with whatever objects are close at hand. So dense is the crowd desperate to take part in the brutal killings, that those on the periphery are more than a dozen rows back from the victims.

A capella religious singing and chanting - known as nasheeds - soundtracks the barbaric scene. 

(dailymail.co.uk)