In the city of Mahmoudiya, about 30km south of Baghdad, a bomb inside a polling center killed a policeman, Iraqi Army Colonel Abdul Hussein said.
At least 14 people died in northeastern Baghdad after explosions leveled two buildings about a kilometer apart, and mortar attacks in western Baghdad killed seven people in two different neighborhoods, police and hospital officials said.
At one of the blasts in northeastern Baghdad, near the northern tip of the Sadr City slum, rescue workers said they could still hear the sound of women and children caught alive under the debris screaming for help.
Rescue workers examined the ruins and used cranes and tractors to lift debris.
An explosion in the mixed neighborhood of Kirayaat, in northern Baghdad, killed one person, police and hospital officials said.
US troops had received reports of 44 significant attacks in Baghdad so far, although most were small, Major William Voorhies said.
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