At least 64 people have been killed in an attack on a Sunni mosque north-east of the Iraqi capital, Baghdad.
Officials say a bomber blew himself up in the mosque during Friday prayers and gunmen fired on fleeing worshippers.
Some reports say Shia militias carried out the attack, but others blame Sunni jihadist group Islamic State (IS).
The area has seen heavy fighting between IS and Iraqi troops backed by Shia militiamen. The US has called IS the most dangerous threat it faces.
Friday’s attack took place in a village mosque in Diyala province, south of Baquba, about 120km (75 miles) from Baghdad.
One security official told AFP news agency that Shia fighters allied with the government had carried out the assault as a reprisal for a bombing that targeted their fighters.
However another official quoted by AP news agency said IS had targeted local Sunnis whose leaders had refused to join them.