BAGHDAD — Three car bombs in towns south of Baghdad killed four people and injured 16 others Thursday, Iraqi police and health officials said. The first bombing took place early in the morning in a residential area of the predominantly Shiite town of Mahmoudiya, killing two people and wounding four, police officials said. Another car bomb went off seconds later at a parking lot near a government agency for electricity, killing one person and wounding three. In the southern city of Hillah, a parked car bomb went off in a commercial area, killing one civilian and injuring nine others, a police officer said. — AP