Police officials said the worst attack took place today night in the southern Baghdad suburb of al-Rasheed, when two car bombs struck a group of Shiite pilgrims walking to the holy Shiite city of Karbala, killing 23 and wounding 55.
Hundreds of thousands of Shiite pilgrims are making their way to the city to commemorate Arbaeen, the end of 40 days of mourning following the anniversary of the death of the Prophet Muhammad's grandson, Imam Hussein, a revered Shiite figure.
Sunni Muslim insurgents in Iraq frequently attack Shiites, who they consider infidels. Usually, Shiite marches to holy cities are poorly protected by Iraqi security forces.
In other violence today, a group of suicide bombers launched a brazen attack on a police station in the town of Beiji, a former insurgent stronghold 250 kilometres (155 miles) north of Baghdad, where a suicide bomber rammed his explosives-laden car into the main gate of the town police station.
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Later in the morning, several bombings hit different parts of Baghdad and northern Iraq, police said.
In southeastern Baghdad, a parked car bomb ripped through a parking lot, killing six civilians and wounding 12.
Another parked car bomb went off in the central Salhia neighbourhood near the heavily fortified Green Zone where key government offices and foreign embassies are located. That attack killed five civilians and wounded 14.