Officers of an elite Iraqi special forces unit, praised by U.S. military commanders earlier this year for its role in fighting ISIS, directed the torture and execution of civilians in Mosul in at least six distinct incidents caught on tape.

“That’s a murder,” retired Green Beret Lt. Col. Scott Mann told ABC News after reviewing the graphic footage. “There should be punishment for anyone doing it. It’s reprehensible and it shouldn’t be allowed on any modern battlefield.”

The alarming footage was smuggled out of Iraq by a prize-winning Iraqi photojournalist, Ali Arkady, who spent months embedded in combat with the elite Iraqi troops leading the fight against ISIS late last year. Since turning over his cache of photos and videos to ABC News, he says he has received death threats from the soldiers he once considered friends and has now fled Iraq to seek asylum in Europe.

“This is happening all the time,” Arkady said of the war crimes he documented, which he recounted in an exclusive interview with ABC News’ Brian Ross to be broadcast tonight on ABC’s World News Tonight with David Muir and Nightline.