The blast in Sadr City occurred about 10:30 a.m. and was targeting street vendors and pedestrians near the hospital. Police said at least five people were killed and 15 wounded.
Another parked car bomb struck a gas station an hour earlier in the Shiite city of Hillah, killing at least two people and wounding 22, provincial police said. The city, 60 miles south of Baghdad, has been the site of some of the deadliest blasts since the war started four years ago, including a double suicide bombing against a crowd of Shiite pilgrims that killed 120 people on March 6.
In northern Iraq, a car exploded about 7 a.m. after the driver parked it near Iraqis looking for work in the center of Tuz Khormato, 130 miles north of Baghdad.
The driver and two workers were killed and 11 others wounded in the attack, police Col. Abbas Mohammed Amin said. He said the driver intended to wait until more workers had gathered before detonating the explosives but they went off prematurely, preventing a higher casualty toll.