Ali Hassan al-Majid, a former Iraqi official known as Chemical Ali, has been executed, a government spokesman has announced.
Majid, an enforcer in Saddam Hussein's regime, was convicted of killing Shia Muslims in 1991 and 1999.
He was also sentenced to death for a gas attack on the Kurdish town of Halabja in 1988.
It is believed that about 5,000 people died in the attack, most of them women and children.
BBC News
