Stomach-churning photographs show a large bloodthirsty crowd gathered at the foot of a multi-storey building in the group's de facto capital Raqqa to watch the murder of the young victim.

With the baying crowd clambering on to rooftops to get a better view of the savage scene, the blindfolded man is dragged to the roof of the tallest building in the neighborhood by bearded militants, who use mobile phones to film him being barbarically thrown to his death.

The images were released by local activist group Raqqa is Being Slaughtered Silently, who work undercover in the ISIS stronghold to expose the terror group's atrocities.

The photographs carry the distinctive yellow logo of ISIS' propaganda wing Al Hayat Media Centre, suggesting they come from an as-yet unreleased video of the savage murder.

The photographs shows a huge crowd gathering at the foot of a run-down building in the west of the city, which ISIS captured in early 2014 amid the ongoing chaos of the Syrian Civil War.

The blindfolded victim - who is understood to be in his 20s - is seen being dragged to the top of the building by three black-masked militants while two armed but undisguised fighters stand at their side using mobile phones to film the gruesome murder.

The next image shows the man plunging to his death, falling face first from behind a white metal railing towards the ground several stories below.

The horrific murder is just the latest example of ISIS throwing men accused of being gay to their death.