ISIS threaten bloodshed against any Muslims thinking about joining US-backed groups in the war-torn Middle East.

Two fighters talking in the video proclaim the group will not stand for anything other than ISIS-run Syria, before members of the Free Syrian Army - who are filmed performing Nazi salutes, say ISIS - are brutally murdered.

The video comes from Wilayat Furat in Iraq, translated to the State of the Euphrates, according to Heavy.

Wilayat Furat an ISIS-occupied area located north of Wilayat al-Anbar on the border of Syria.

The aim of production of such a video is to threat Muslim fighters who have joined or are thinking of joining US-backed Syrian rebel groups. 

Towards the end of the video, the two terrorists deliver a speech accusing the US of trying to take over the Middle East.

The final act of the video sees militants dressed in black throwing members of the Free Syrian Army to the ground in the desert.

ISIS fighters take the men, who are dressed in Guantanamo Bay-style orange jumpsuits, and behead them with small knives.

The men's heads are then removed from their bodies and placed on spears, Daily Mail reported.

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