It is almost 25 years since the town of Halabja in northern Iraq suffered the worst chemical weapons attack ever perpetrated against a civilian population.
At least 5,000 people are thought to have died in what is now seen as a campaign of genocide launched by Saddam Hussein against the Iraqi Kurds.
Today there are new initiatives to open the mass graves where many of the victims are buried to establish which foreign companies helped supply the lethal cocktail of chemicals and nerve agents that were used.
The BBC's world affairs editor John Simpson was one of the first international journalists to reach Halabja in 1988 and he went back to meet some of the survivors.
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