Isis prisoners hung upside down before they are killed.Video screengrab

In a fresh show of barbarism it is capable of enacting, the Islamic State group released a video that purportedly contains visuals of its prisoners -- clad in orange jumpsuits -- being hung upside down from meat hooks in what looks like a factory, and then being slaughtered -- killed and cut open -- like sheep and goats.

What is even more shocking is the similarities between the manner in which these prisoners were killed and how sheep and goats are sacrificed on Eid al-Adha, the holy festival Muslims celebrate all over the world. That the video was released on this occasion is being seen as no coincidence.

The video, titled "The Making of Illusion," shows people purportedly from the Der Ezzor province of Syria, a stronghold of the Islamic State group, which is also known as Islamic State of Iraq and Syria (Isis) or Islamic State of Iraq and the Levant (Isil).

All the men are shown dressed in orange jumpsuits, a common trait among people in videos who Isis says are its prisoners. Many of them are blindfolded, and their hands tied behind them. The video depicts them in what could be either a factory or a prison, while some are saying it could also be an abattoir or a slaughterhouse.

The video initially names many -- if not all -- of the "prisoners" who go on to be killed. It then shows the Syrians being hung upside down from meat hooks, their hands restrained behind them with zip-ties. At one point, two of them are also shown being carried like goats on two arms by an Isis member.

Their throats are then slit -- much like how goats and sheep are cut in the halal way so their meat is deemed safe for eating by Muslims. Their "execution" happens because Isis suspects them to be spies.