Two bombs exploded outside a Sunni Muslim mosque in the Iraqi city of Baquba as worshippers left after Friday prayers, killing at least 43 people.
The first bomb exploded outside the mosque and the second explodedas crowds of people rushing to help the wounded.
It was one of the deadliest attacks in a surge in sectarian violence over the past month. Images of bodies, pools of blood and scattered shoes were shown on television.
Baquba is about 50km northeast of Baghdad.
Another eight people were also killed and more than 20 wounded on Friday by a roadside bomb at a funeral of a Sunni cleric killed in Baghdad on Thursday.
Since the American withdrawal at the end of 2011, the coalition government has been caught in a power struggle between Shi'ites, Sunnis and Kurds who split cabinet posts between them.