Reports from Iraq say a car bomb has exploded in the eastern city of Baquba, killing at least 10 people and wounding more than 40.
Officials said the bomb went off in Baquba's Shifta area on May 9.
The Amaq news agency, which supports the Islamic State (IS) extremist group, said a suicide bomber had targeted Shi'ite militia fighters in the capital of Diyala Province.
The death toll is expected to to rise.
In January 2015, Iraqi officials declared victory over the IS group in Diyala, a mixed Shi'ite and Sunni Muslim area bordering Iran, after security forces and Shi'ite militias drove them out of towns and villages there.
But Baquba and other towns in the province have been hit by a number of bomb attacks carried out by IS militants.