The blasts came as a firebrand Shiite 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 today. But their targets, shopping streets and bus stations, are frequently hit by the al-Qaida breakaway group that is the country's main insurgent force, as it tries to undermine government efforts to maintain security.
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. Hillah is about 95 kilometres south of Baghdad. Outside Hillah in the town of Musayyib, about 60 kilometres south of Baghdad, a parked car bomb explosion killed five civilians and wounded 13.
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Medical officials confirmed the figures. All spoke on condition of anonymity as they were not authorised to release information.
Also today, 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.