Militants of the Islamic State group downed a fighter plane recently, and then killed the pilot and crucified the body. The incident is believed to have taken place in the Deir Ezzor province in eastern Syria.

The al Amaq news agency, which leans heavily towards the Islamic State group, also known as the Islamic State of Iraq and Syria (Isis) or the Islamic State of Iraq and the Levant (Isil), released a video of the incident which shows the burning remains of the plane strewn over a hillside, with black smoke billowing from them.

The Syrian Observatory for Human Rights, a monitoring group based out of the U.K., said in a post on its official Facebook page: "ISIS targeted the warplanes over Thardeh Mountains near Deir Ezzor airbase in the vicinity of Deir Ezzor city, and it crashed and the pilot was killed. [sic]"

Isis militants then crucified the pilot's body, and placed a model aircraft atop the cross.

It is yet to be determined whether the plane belonged to the Syrian regime or the coalition forces that have taken on Isis, which is also referred to as Daesh locally.

The incident come just a few days after the militants had shot down a Russian helicopter in Homs in Syria. The two pilots of the helicopter, which crashed in the Palmyra desert, were killed by militants soon after.

The SOHR had said on Facebook: "It turned out that the helicopter that was targeted and shot down by the "Islamic state" is Russian helicopter, it landed in Palmyra desert, which killed its crew whom are from the Russian Force [sic]."