Baghdad: At least 42 Iraqis were killed and scores wounded in violence across Baghdad on Tuesday, police sources said as joint U.S.- Iraqi army raids continued across the capital.

At least 16 Iraqis were killed and 30 wounded when a woman suicide bomber blew herself up among a crowd of people in al-Muqdadiya town, said police sources. Volunteers were gathering at a building housing a police station and a local court to sign up for the police force when the suicide attacker detonated her explosives belt. The attack hit both the civilians and police officers in the area and the death toll was expected to rise, local sources said describing the blast as ``intense.''

Police forces quickly sealed off the town near Baquba, 60 km north of Baghdad.

Iraqi and US military forces conducted air and ground raids in al-Fadl district of Baghdad. Witnesses said at least 20 Iraqis had been killed. The dead included two youths. Several women and children were among 30 injured.

Four U.S. soldiers were killed in combat operations on Monday, the U.S. military announced on Tuesday. One soldier died in al-Anbar province, while three were killed when an improvised explosive device detonated near their patrol in Baghdad. AP