Sarin: what is the deadly poison used in the Idlib attacks?

During the Syrian civil war, Bashar al-Assad’s forces have generally used chemical weapons – mostly chlorine gas – to spread confusion in areas where regime troops are on the offensive, said Igor Sutyagin of the Royal United Services Institute. "The other tactic is like a sniper, lure rescuers to the scene and then hit them. It is a way of concentrating people to the target," he said.