The country, invaded by US-led forces in March, has been rocked by attacks since US President George Bush declared major combat operations over on 1 May.
Following is a list of the most deadly attack:
24 June: Six British military police are killed in the southern Shiite town of Al-Majar Al-Kabir in a gun-battle with residents, angry about house searches for illegal weapons using dogs, considered unclean in Islam.
5 July: Seven US-trained Iraqi police recruits are killed and 40 wounded in a blast at a training centre in Ramadi, west of Baghdad.
7 August: A car bomb outside the Jordanian mission in Baghdad kills at least 14 people and wounds dozens.
11 August: Six Iraqi prisoners die and 59 are wounded when the Abu Gharib prison west of Baghdad comes under mortar fire.
19 August: A truck bomb outside UN headquarters in Baghdad kills 22 people, including the world body's Iraq envoy, Sergio Vieira de Mello.
UN chief envoy Sergio Vieira de
Mello (R), was killed in August
29 August: A car bomb kills 83 people, including Iraq's leading Shiite politician, Ayatollah Muhammad Baqir al-Hakim, and wounds 125 outside one of Shiite Islam's holiest shrines in the central Iraqi city of Najaf.
25 September: Eight Iraqi civilians die and 18 are injured when a mortar bomb strikes a crowded square in Baquba, a city northeast of Baghdad.
12 October: At least six people are killed and 10 seriously wounded in a suicide car bombing outside the Baghdad Hotel, home to US security personnel and contractors, as well as some members of the US-backed Governing Council.
26 October: Rockets pound Baghdad's Rashid Hotel where US Deputy Defence Secretary Paul Wolfowitz is staying, killing a soldier and wounding 17 other people.
27 October: Explosions across Baghdad target four police stations and the International Committee of the Red Cross, killing at least 43 people and wounding 200.
2 November: A Chinook helicopter carrying US troops on leave is shot down by a missile near Fallujah, killing 16 soldiers and wounding 26.
7 November: A US Black Hawk helicopter is downed in Saddam's hometown of Tikrit, north of Baghdad, probably by a rocket-propelled grenade, killing all six aboard.
12 November: A truck bomb attack in Nasiriya, southern Iraq, kills 28 people, including 19 Italians in the worst attack on Italian troops since World War II.
15 November: Two Black Hawk helicopters collide over the northern city of Mosul after reportedly coming under fire, killing 17 US soldiers.
22 November: At least 18 Iraqis are killed in twin suicide bombings on police stations north of Baghdad.
29 November: Ambushes kill seven Spanish intelligence agents near Suwayrah, south of Baghdad, two Japanese diplomats and their Iraqi driver near Tikrit, two US soldiers near the Syrian border and a Colombian civilian contractor in northern Iraq.
14 December: An explosion at the Khaldiya police station in western Iraq kills 16 policemen and two civilians, including a seven-year-old girl, and wounds 29 more people, the day after the capture of former president Saddam Hussein.
Iraqi police walk past a burning
car after a bombing near a hotel
15 December: Two nearly simultaneous car bombs kill eight people and wound at least 17 at Baghdad police stations.
24 December: A suicide bombing kills five people, including the bomber, and wounds 101 when a pick-up truck blows up at interior ministry offices in the Iraqi Kurdish city of Arbil.
27 December: Seven coalition soldiers -- five Bulgarians and two Thais -- and 12 Iraqis are killed and at least 180 people wounded, most of them Iraqis, in a multiple car bomb and mortar attack in the central city of Karbala.
31 December: Eight people are killed and 24 wounded when an explosives-packed car rams into a popular Baghdad restaurant on New Year's Eve.
18 January: At least 25 people, mainly Iraqis, are killed and about 130 in a devastating suicide car bombing outside the US headquarters in Baghdad. At least two of the dead are believed to be US contractors.
1 February: Fixty-six people are killed and some 200 wounded when twin suicide bombers blew themselves at the headquarters in the normally tranquil Kurdish-held city of Arbil of the two leading Kurdish political parties.