Iraqi officials say a series of explosions mainly targeting Shiite worshippers have killed at least 58 people, AP reported.
The violence appeared to be an attempt by insurgents to demonstrate they are still a potent force days after Iraqi authorities announced the killings of the top two al-Qaida in Iraq leaders in what was seen as a major blow.
The biggest of Friday's bombings targeted the offices of an anti-U.S. Shiite cleric in the vast slum of Sadr City in Baghdad.
Police and hospital officials said at least 25 people were killed and more than 100 wounded there.
At least 33 people were killed in other explosions, including in western Iraq.
The officials spoke on condition of anonymity because they were not authorized to speak to reporters.