The attacks came as Iraqi Shiites were celebrating the birthday of Imam Ali, the cousin and son-in-law of the Prophet Muhammad and Shiite Islam's most sacred martyr.

In the Baghdad neighborhood of Sadr City, a car bomb went off in the morning hours, killing four people and wounding six, police officials said.

Another car bomb elsewhere in Sadr City exploded near a cluster of homes, killing two people and wounding seven.

Associated Press footage from one of the Sadr City attacks showed a thick cloud of smoke rising from the blast area where several cars were on fire.

A short while later, a car bomb exploded in a commercial street in Baghdad's eastern district of Jamila, killing three people and wounding 10.

Police said a fourth car bomb went off near a traffic police office in eastern Baghdad, killing four people, including a traffic policeman. Seven people were wounded in that attack.

Also Tuesday, a car bomb exploded at a square in downtown Baghdad, killing two people and wounding eight, police said. Another car bomb went off in a commercial street in Baghdad's Shiite eastern district of Ur, killing five people and wounding 11.

Elsewhere in Baghdad, a car bomb exploded near an out-door market in the eastern Shiite suburb of Maamil, killing three people and wounding 14.

In the afternoon, a car bomb went off near a market in Baghdad's southern Dora district, killing five people and wounding 12 others.

No group immediately claimed responsibility for the attacks, which bore the hallmarks of al-Qaida-inspired militants.

Medical officials confirmed the casualty figures. All officials spoke on condition of anonymity because they were not authorized to talk to media.

According to the United Nations, 8,868 people were killed in Iraq last year _ the country's highest death toll since 2007 and 2008.

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