The blasts, which came in quick succession, targeted residents out shopping and on their way to work.
The attacks are the latest in a relentless wave of killing that has left thousands dead since April, marking the country's worst spate of bloodshed since 2008. They raise fears that Iraq is hurtling back toward the brink of a civil war fueled by ethnic and sectarian differences.
Insurgents deployed explosives-laden cars, suicide bombers and other bombs today and targeted parking lots, outdoor markets and restaurants in predominantly Shiite neighborhoods of Baghdad, according to officials. A military convoy was also hit south of the capital.
There was no immediate claim of responsibility for the day's attacks, but they bore the hallmarks of the Iraqi branch of al-Qaida. It frequently targets Shiites, which it considers heretics, and employs coordinated bombings in an attempt to incite sectarian strife.
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Many of the blasts targeted morning shoppers. A parked car bomb detonated in a commercial area in the northern Shaab neighborhood, killing nine and wounding 15.
Blasts also hit the neighborhoods of Bayaa, Jamila, Hurriyah and Saydiyah, claiming a total of 12 lives.
In Mahmoudiyah, about 30 kilometers south of Baghdad, a suicide bomber blew himself up outside a restaurant, killing four and wounding 13.