A look at chemical attacks in Iraq

Recent chemical attacks and related actions:

__ Apr. 6: A suicide bomber driving a truck loaded with TNT and toxic chlorine gas crashes into a police checkpoint in western Ramadi, killing at least 27 people and wounding dozens.

__ March 28: Iraqi security forces shoot two suicide truck bombers carrying highly toxic chorine before they reach a government complex in Fallujah, but the explosives detonate, wounding 15 U.S. and Iraqi forces.

__ March 16: Three suicide bombers driving chlorine-laden trucks strike in the Sunni insurgent stronghold of Anbar province, killing two policemen and forcing about 350 Iraqi civilians and six U.S. troops to seek treatment for exposure to the gas.

__ Feb. 22: U.S. military discovers car bomb factory with propane and chlorine in Anbar. U.S. troops discover vehicles being prepared as car bombs, as well as detonation material in five buildings.

__ Feb. 21: A pickup truck carrying chlorine gas cylinders is blown apart in Baghdad, killing at least five people and sending more than 55 to hospitals.

__ Feb. 20: A bomb planted on a chlorine tanker leaves more than 150 villagers stricken north of the capital. More than 60 remain under medical care the following day.

__ Feb. 19: A suicide car bombing in Ramadi involving chlorine kills two Iraqi security forces and wounds 16 other people, including 13 civilians.

__ Jan. 28: A suicide bomber driving a dump truck filled with explosives and a chlorine tank strikes a quick reaction force and Iraqi police in the Sunni city of Ramadi, killing 16 people.