Two American Special Operations advisors to the Iraqi Special Forces were killed during an operation against Islamic State (ISIS) remnants in the Qarachogh mountain region of northern Iraq on Sunday, the U.S.-led coalition released in a statement Monday.

“Two U.S. service members were killed by the enemy while advising and accompanying Iraqi Special Forces during a mission to eliminate an ISIS terrorist stronghold in a mountainous area of north-central Iraq,” according to a statement from the Combined Joint Task Force — Operation Inherent Resolve.

The names of the two troops killed are being withheld pending notification of their next of kin. SOFREP has learned that the two Americans were Marine Raiders from the Marine Forces Special Operations Command (MARSOC).

The operation took place in the Qarachogh Mountains, outside of the town of Makhmour. Rudaw, the Kurdish media network, was the first to report on Sunday that coalition aircraft provided cover along with attack helicopters, while soldiers fast-roped onto the objective.