Read the reports. .The poison gas was released when weapons factories run by the terrorists were bombed The gas is used in rockets by the terrorists   most of which are shipped to Iraq for use by ISIS . To claim this is an Assad or Russian  attack is just  another example of deliberate distortion or fake news. This is not surprising given that it is coming  from the usual suspects who have supported ISIS and terrorism in the region to attain their political goal of illegal regime change.