The fact-finding mission by chemical weapons watchdog Organisation for the Prohibition of Chemical Weapons (OPCW) concluded Sarin, a banned nerve agent, was used in the attack on Khan Sheikhoun in Idlib province.
The attack on Khan Sheikhoun in Idlib province was the deadliest in Syria in more than three years. It prompted a retaliatory US missile strike against a Syrian air base the US said had launched the attack.
The OPCW, which is based in The Hague, reached that conclusion after interviewing witnesses and examining samples.
