A look at some of the deadliest attacks in Iraq since major combat was declared over on May 1, 2003:
— April 21: Five blasts near police stations and police academy in southern city of Basra kill at least 55 people.
— March 2: Coordinated blasts strike Shiite Muslim shrines in Karbala and in Baghdad, killing at least 181.
— Feb. 11: Attacker blows up a car packed with explosives in a crowd of Iraqis waiting outside an army recruiting center in Baghdad, killing 47 people.
— Feb. 10: Homicide bomber explodes a truckload of explosives outside a police station in Iskandariyah, killing 53 people.
— Feb. 1: Twin homicide bombers kill 109 people in two Kurdish party offices in Irbil.
— Jan. 18: Car bombing near main gate to U.S.-led coalition's headquarters in Baghdad kills at least 31 people.
— Dec. 27: Homicide bombers and assailants with mortars and grenade launchers blast coalition bases and governor's office in Karbala, killing 19.
— Dec. 14: Homicide bomber detonates explosives in car outside police station west of Baghdad, killing at least 17.
— Nov. 12: Homicide truck bomber attacks headquarters of Italy's paramilitary police in Nasiriyah, killing more than 30 people.
— Oct. 27: Four homicide bombings target International Red Cross headquarters and four Iraqi police stations in Baghdad, killing 40 people, mostly Iraqis.
— Aug. 29: Car bomb explodes outside mosque in Najaf, killing more than 85 people, including Shiite leader Ayatollah Mohammed Baqir al-Hakim.
— Aug. 19: Truck bomber strikes United Nations headquarters in Baghdad, killing 23 people including top U.N. envoy.
— Aug. 7: Car bomb explodes outside Jordanian Embassy, killing 19 people.