Four victims were burning to death by ISIS and the execution video was posted online by ISIS militants.
The victims are identified as fighters in the pro-government Popular Mobilisation forces from southern Iraq.
They were forced to wear orange jumpsuit and tied to chains by their hands and feet, and were hung from a metal frames.
And then, one of the ISIS fighters carried torch to set on fire according to the footage.
“Now retribution has come, for today, we will attack them as they attacked us, and punish them as they punished us,” a masked ISIS fighter said in the video.
Although the footage did not give a specific location for the execution, it showed a tag indicating that it was produced by the ISIS media unit responsible for Anbar province in Iraq.
The video included a clip showing that a famous Shiite fighter Abu Azrael (“Father of the Angel of Death”) cut off a burned body with a sword.
ISIS has carried out mass executions and a campaign of killings, kidnapping and rape targeting minorities in territory it controls in Iraq and Syria.
The video posted online has recorded many killings including beheadings, shootings, drownings and burnings.