Islamic State extremists at Iraq's ancient city of Hatra destroyed the archaeological site by smashing sledgehammers into its walls and shooting Kalashnikov assault rifles at priceless statues, a new militant video purportedly from the group shows. 

Militants attacked Hatra, a UNESCO World Heritage site, last month, officials and local residents said, though the extent of the damage remains unclear as it is in territory still controlled by the Islamic State group. 

The video, released overnight Friday, shows a militant on a ladder using a sledgehammer to bang repeatedly on the back of one of the carved faces until it crashes to the ground and breaks into pieces. The video also shows a militant firing a Kalashnikov rifle at another, while men chop away the bases of some of the larger wall sculptures.