Graphic warning: Mass graves found in Iraq could contain up to 400 bodies

Mass graves found in an area recently retaken from ISIS group could contain up to 400 bodies, according to an Iraqi official.

Kirkuk governor Rakan Saed said The bodies of civilians and security forces have been found in an abandoned base near Hawija, a northern town retaken in early October.

Khalaf Luhaibi, a local shepherd who led troops to the site, says ISIS used to bring captives to the area and shoot them dead or pour oil over them and light it on fire.

The area was strewn with torn clothing and what appeared to be human bones and skulls.

Iraqi forces have driven the ISIS group from nearly all the territory it once controlled.

Authorities have already uncovered several mass graves in other newly liberated areas