At least 45 people are reported to have been shot dead by off-duty Shia policemen in the northwestern Iraqi town of Tal Afar a day after deadly lorry bombings hit a Shia area of the town.
The policemen roamed the town's Sunni neighbourhoods for two hours shooting at Sunni residents and homes early on Wednesday, security officials said.
"I wish you can come and see all the bodies. They are lying in the grounds. We don't have enough space in the hospital. All of the victims were shot in the head," a doctor at the town's main hospital said.
"No less than 45 people were killed. I've never seen such a thing in my life."
The Iraqi army later moved into the Sunni areas to stop the violence and a curfew has been imposed, the officials said.
Wathiq al-Hamdani, the provincial police chief, said: "The situation is under control now."
"The local Tal Afar police have been confined to their bases and policemen from Mosul are moving there to replace them."
In Tuesday's truck bombings in Tal Afar, one suicide bomber lured victims to buy wheat loaded on his truck in a Shia area of the town.
A second truck bomb exploded in a used car lot. The attacks killed at least 55 people and wounded 185.
Tal Afar is 418km northwest of Baghdad.