Sarin used in Syria 5 days before Khan Sheikhun: OPCW (2) Sarin nerve agent was used in an 'incident' at a northern Syrian village in late March, five days before the deadly attack on Khan Sheikhun, says Ahmet Üzümcü, director of Organisation for the Prohibition of Chemical Weapons. IMAGES AND SOUNDBITESCOMPLETES VID1087281_EN