Iraqi police say two car bombs have exploded in central and western Baghdad, killing at least four people. They say one was a suicide car bomb targeting a police patrol in Nisoor Square on the capital's west side. Police say a civilian and a policeman were killed and five other people were wounded. The other blast took place Saturday afternoon at a small bus station in central Baghdad, killing two civilians and wounding nine. The station is a hub for buses heading east into Shiite neighborhoods.