A look at recent major attacks in Iraq:

— Jan. 20 — Pair of bombs targeting Shiite pilgrims heading into holy city of Karbala kill at least 50.

— Jan. 18 — Suicide bomber kills 65 people in crowd of police recruits in Saddam Hussein's hometown of Tikrit.

— Dec. 12 — Suicide bomber blows up car outside government offices in western city of Ramadi, killing 17 people, including women and elderly people waiting to collect welfare checks.

— Nov. 2 — Bombings and mortar strikes across Baghdad's mostly Shiite neighborhoods kill 76.

— Oct. 31 — Militant siege of Baghdad church service kills 68.

— Oct. 29 — Suicide bombing at popular Baghdad cafe kills 26.

— Sept. 19 — Two car bombs in Baghdad kill 31.

— Aug. 25 — Nearly two dozen attacks spanning the country — most targeting security forces — kill at least 56 Iraqis. The attacks take place a day after the number of U.S. troops fell below 50,000 for the first time since the start of the war.

— Aug. 17 — Suicide bomber blows himself up among hundreds of army recruits near a military headquarters in central Baghdad, killing 61.

— July 18 — Suicide bomber strikes anti-al-Qaida Sunni fighters waiting for paychecks, killing 45 in Radwaniya, southwest of Baghdad.

— May 10 — Series of blasts and shootings across Iraq kills at least 119 in Iraq's deadliest day in 2010.