A new wave of car bombs has ripped through commercial areas in the Iraqi capital and areas to the south, killing at least 33 people and wounding dozens.
The blasts came as a firebrand Shi'ite cleric delivered a blistering criticism of Prime Minister Nouri al-Maliki in a rare televised address.
Muqtada al-Sadr also reiterated his earlier declaration that he was retiring from politics.
There was no immediate claim of responsibility for the explosives-laden parked cars that detonated on Tuesday.
But their targets, shopping streets and bus stations, are frequently hit by the al-Qaeda breakaway group that is the country's main insurgent force.
The group, known as the Islamic State of Iraq and Levant, has taken responsibility for similar attacks before.
In Baghdad, four such bombings killed at least 17 people and wounded 49 others.
The deadliest hit a bus station, leaving seven dead and 18 wounded.
Police say another four bombs went off simultaneously in the southern city of Hillah, killing at least 11 people and wounding 35 others.
Outside Hillah in the town of Musayyib, about 60 kilometres south of Baghdad, a parked car bomb explosion killed five civilians and wounded 13.
Medical officials confirmed the figures and all spoke on condition of anonymity.
The attacks came a day after a series of explosions in the capital left at least 23 dead. Iraq is experiencing a resurge in violence to levels unseen since the worst of the country's sectarian fighting began to subside in 2007.
Also on Tuesday, al-Sadr repeated an earlier announcement that he was retiring from politics, but also called on his followers to vote in Iraq's upcoming elections and berated current rulers as "blood-thirsty wolves."
