Islamic State's latest propaganda video shows 21 imprisoned Kurdish Peshmerga fighters being paraded in the streets of Kirkuk in cage.
The Kurdish militia fighters are believed to have been beheaded by the Islamists after video was shot, but this is yet to be confirmed.
During the video, a member of Isis, holding a microphone emblazoned with the terror organisation's logo, interviews some of the fighters.
The nine-minute video, entitled Healing the Chest of Those who Believe, is in Kurdish accompanied by Arabic subtitles, also runs captions giving details about each hostage.
"We say to the Peshmerga: Leave your jobs, or your fate will be like these, either the cage, or under the ground," the Isis militant warns in the footage.
It is still unclear when or where exactly video was shot, but it is seen as being largely consistent with the group's earlier videos of prisoners and executions.
However, claims that the Peshmerga were beheaded cannot be independently verified, as the hostages are seen alive at the end of the video.
Kurdish Peshmerga forces have been engaged in a bitter battle with Isis militants for several months.
The Kirkuk province is located along the border northern Iraq. It is home to Kurds, Turks and Arabs, who all claim the region as their own.