Police have found 60 bodies scattered around the Iraqi capital, the majority dumped in predominantly Sunni Arab areas of Baghdad, officials said.
All the bodies were bound, bore signs of torture and had been shot, police 1st Lt Thayer Mahmoud said.
Such killings are usually the work of death squads, operated by both Sunni Arabs and Shiites, who abduct people, usually torture them with power drills and then shoot them.
They bodies were found overnight, 45 were discovered in predominantly Sunni Arab parts of western Baghdad.
The rest were found in predominantly Shiite areas of eastern Baghdad.