all you have to do is look up Saran gas and a chlorine based gas which could be phosgene gas don't need to be a rocket scientist  to figure that out just by seeing how the people died, if was Saran the first responders would be dead just by touching someone who was hit by Saran gas, the first responders had no protective clothing just there plain clothes and no gloves so that rules out Saran gas  if phosgene or any other chlorine based gas that would cause you to choke to death like how those victims died by choking so there is the difference, in WWI the Germans used phosgene gas to kill allied soldiers, so that's why its fake news reporting that Saran gas was used  which it wasn't.