The blast comes after a series of bombings killed dozens of Shia pilgrims during their annual pilgrimage to the holy city of Karbala last week.
A spate of bombings in the past month against pilgrims, police recruits and security forces across Iraq has killed more than 100 people.
The car that exploded on Thursday was parked near a funeral tent in the capital's north-western Shula district, an interior ministry source said.
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