An account associated with the Islamic State released gruesome footage on Tuesday showing the execution of several men. The video was allegedly taken in Iraq's northern Ninawa province.

The stylized seven-minute clip depicts graphic scenes of at least 16 men, apparently held prisoner by the group, dying in a series of horrifying scenarios. It's still unclear exactly where and when the footage was taken. The victims' identities are unknown.

See also: I was a prisoner of the Islamic State

The footage was posted to an anonymous file-sharing site where the group often posts videos and photos and was branded with the now infamous black flag associated with ISIS. It's the latest in a series of propaganda clips from the group depicting prisoner executions and is reminiscent of a February video of a Jordanian pilot being burnt alive.

SITE Intel Group says ISIS described the footage as showing the execution of "spies."

IS Video Shows Execution of Spies by Drowning, Beheading with Explosive Cord, and Immolating http://t.co/Nb8dreHkhQ — SITE Intel Group (@siteintelgroup) June 23, 2015

The video shows harrowing scenes of executions, including one in which five men are handcuffed and placed in a cage outfitted with cameras. The men can be seen struggling for air as a crane lowers them down into the water.

Screen shot from a clip posted by Islamic State militants show

ISIS militants hold large swathes of land in northern Iraq and eastern Syria, and have controlled Mosul, the capital city of the Ninawa province, since last summer.

Mosul in particular has been the target of U.S.-led coalition airstrikes in recent days. There have reportedly been 28 airstrikes in the area in the last week alone.