Twin car bombings in Babel resulted in at least 31 people being killed and 120 people injured, security officials told IraqiNews.com.
Explosives in two other cars parked near a trade chamber in Babel's Shawi neighborhood were detonated earlier, killing and injuring an unknown number of people, IraqiNews.com said.
In Mosul, a police officer and a civilian were killed and two other people were injured when a car bomb exploded, officials said.
"A car bomb that was parked at a roadside blew up [near] a police patrol, resulted in [the] killing [of] a policeman and [injury to] two others in [the] Karama neighborhood of eastern Mosul," a security official said. "The explosion also led to [the] killing [of] a civilian who was ... near the incident spot."
Two people died and 20 others were injured in a car bomb explosion in Karbala, a health official said.
The blast occurred near the center of the city, the Karbala Health Department director said.