Barbaric ISIS execution video shows prisoner tied to a pole and executed by machine gun before being beheaded

GRUESOME new footage has emerged purporting to show ISIS militants beheading a man after shooting him dead with a machine gun.

The horrific clip was posted online and features a lengthy interview with the man, during which he is accused of being a "spy" - a catch-all term used by ISIS to justify its executions.

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According to Heavy.com, the footage was filmed in Aleppo and the prisoner repeatedly refers to himself as a "rafidi".

This term is often used to refer to Iranians or other Shia Muslims - a sworn enemy of Sunni ISIS.

Although the exact source of the video cannot be verified, it bears all the hallmarks of the terror group's propaganda videos.

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The clip begins by featuring images of Barack Obama, Francois Hollande, and Recep Erdogan, and a lengthy interview with the prisoner dressed in orange overalls.

It then cuts to an outdoor scene where the prisoner is tied to a post.

In the distance, a jihadi wielding a machine gun has him lined up in the crosshairs - and starts firing.

After the prisoner is left slumped on the ground, another man approaches, and using a knife, beheads him in scenes too graphic to publish.

Meanwhile, Turkish police today detained two suspected ISIS would-be suicide bombers near the border with Syria.

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State-run Anadolu Agency said the two were detained in Sanliurfa province together with their suicide vests and explosives.

The arrests come a day after Istanbul police detained some 40 foreign nationals suspected of links to ISIS in simultaneous raids in the city's Fatih neighborhood.

Those detained included nationals from Azerbaijan, Iran, Iraq and Afghanistan, Anadolu reported, adding that some of them had traveled to conflict zones in Syria several times.

Turkey has suffered a wave of suicide bomb attacks blamed on ISIS since last year that have killed more than 200 people.

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