The main entrance of the headquarters of the Organization for the Prohibition of Chemical Weapons (OPCW), is seen in The Hague, Netherlands on May 5, 2017. (Photo: AP) Syria International watchdog investigation finds Islamic State used mustard gas in 2015 attack in Syria
An Iranian soldier wears a gas mask to protect against chemical weapons at his position on Majnoon Island, Iraq, on March 10, 1984. (Photo: AP) Europe Dutch court orders company to compensate 5 Iranian victims of Iraqi mustard gas attacks in the 1980s
