Some of the deadliest days in Iraq since January 2006:

April 18, 2007: At least 157 people are killed in four bombings in mostly Shiite areas of Baghdad, including 112 in an explosion at a market.

March 29, 2007: At least 179 people are killed, including 104 by multiple suicide bombers in the town of Khalis and in predominantly Shiite markets in Baghdad.

March 27, 2007: Truck bombs hit markets in the northwestern city Tal Afar, killing at least 198 and wounding more than 150 people.

March 6, 2007: Officials report 194 deaths, including 120 by two suicide bombers in a crowd of Shiite pilgrims in Hillah, about 60 miles south of Baghdad.

Feb. 3, 2007: Officials report 167 deaths, including 137 by a suicide truck bomber at a market in a predominantly Shiite area of Baghdad.

Feb. 1, 2007: Officials say 138 people are killed nationwide, including 73 who die in two suicide bombers in a crowded market in Hillah.

Jan. 22, 2007: Officials report 138 deaths, including 88 by a parked car bomb followed immediately by a suicide car bomber in a predominantly Shiite area in Baghdad.

Jan. 16, 2007: Violence throughout the country kills 142 people, including 70 in bombings at a university in Baghdad.

Dec. 12, 2006: A suicide bomber strikes a crowd of mostly poor Shiites in Baghdad, killing at least 63 people and wounding more than 200. At least 59 other Iraqis are killed or found dead.

Dec. 2, 2006: A triple car bombing strikes a food market in a predominantly Shiite area in central Baghdad, killing at least 51 and wounding 90 people.

Nov. 23, 2006: Mortar rounds and five car bombs kill 215 people in the Shiite neighborhood of Sadr City.

Nov. 12, 2006: Raging sectarian violence across the country claims at least 159 lives, including 35 men blown apart while waiting to join Iraq's police force.

Jan. 5, 2006: Suicide bombers infiltrate a line of police recruits and a crowd of Shiite pilgrims in Baghdad as insurgents kill 125 civilians and five U.S. soldiers.