At least 24 people were killed in Baghdad itself, as the capital was wracked by at least eight explosions. The worst was a suicide car bomb near the Mishin shopping centre, in the southeast, which killed seven people and wounded 27.
Police said a mortar shell was fired at the site to lure people in before the car bomber detonated his vehicle, ensuring maximum casualties.
A bomb then exploded in the Suq Haraj market in the Bab al-Sharqi area, killing three and wounding 19, a medic at Al-Kindi hospital said.
Later, a suicide car bomb exploded in a village near the Abu Ghraib area on the capital's western outskirts, killing five and wounding six.
Northeast Baghdad's mixed Sunni-Shiite Qahira neighbourhood was hit by a blast that shook the Faraj market, killing three people and wounding 12.
The nearby College of Fine Arts was also attacked by a car bomb that killed two more and wounded three others.
Security forces were targeted as well, with one bomb near an Iraqi army patrol killing a soldier and wounding four passers-by on east Baghdad's Palestine Street.
Three policemen were also wounded in a roadside bombing near central Baghdad's Al-Shaab stadium.
On Thursday nine mortar rounds were fired, hitting the Sunni Adhamiyah district, killing three and wounding 11 and while three mortar rounds hit the Shiite Kadhimiyah district, wounding 15.
The flashpoint city of Baquba, northeast of the capital, reported 10 deaths in numerous incidents.
An Iraqi army source said 34 people were also arrested in Baquba for carrying out violent attacks, including five Egyptians and five Sudanese.
Police also recovered 34 bodies, 25 of them in Baghdad, of people killed in sectarian bloodshed.
Southern toll
Deep in the south of the country, meanwhile, one civilian was killed and another three wounded when a bomb exploded near their car northeast of the city of Amara, a security official said.
The wave of violence erupted in Baghdad and other volatile regions when a round-the-clock curfew was lifted Tuesday.
It was imposed to thwart any attacks during an Iraqi High Tribunal hearing that sentenced deposed dictator Saddam Hussein to hang for ordering the execution of 148 Shiites from the village of Dujail in the 1980s.