A series of bombings and shootings on Monday left at least 23 people dead and more than 20 wounded, Iraqi security officials and medical workers said. Just after sunset, an explosion at a market in central Baghdad killed 12 people, the police said. Earlier, a suicide bomber attacked a police checkpoint north of Baghdad, killing three police officers and two civilians. South of Baghdad, two militia members were killed by a roadside bomb. Another militia member was killed by a bomb attached to his car in Salahuddin Province, north of Baghdad, while a roadside bomb near a high school in the region killed a woman. In Baghdad, a bomb blew up a truck driver and gunmen killed a Ministry of Justice employee. More than 300 Iraqis have been killed this month in similar attacks.