There's video footage that the "rebels" launched the 2013 chemical attack. They needed to sell foreign intervention in Syria. And just to be clear, the rebels are nothing but Al Qaeda and ISIS terrorists - anyone who tells you otherwise is full of it. No secular minded moderate human being would still be trying to topple the Syrian government for the good of the people. The Syrian government is a moderate secular regime, and the only Arab government that isn't tied to extremists.