From 1983, Iraq began to use poison gas against Iranian troops, increasing the intensity of its use from the next year. In March 1988, after the Iranians took the Kurdish town of Halabja, the Iraqis bombed the town with chemical weapons, killing about 4,000 Kurds. Through the war, Iraq used 110,000 chemical munitions against Iran.48 At this time, Iraq enjoyed the backing of the US and its European allies. From the US, Iraq obtained satellite imagery that showed Iranian troop movements. The US also threw its weight behind Iraq at international fora, while ignoring its development and use of
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