This from @BBCPanorama: "there is enough evidence to be confident that at least 106 chemical attacks have taken place in Syria since September 2013."
bbc.com/news/world-mid…
bbc.com/news/world-mid…
Note that the @BBCPanorama piece looks at accusations against all sides, including evidence of three further attacks by ISIS. 
Stand by for the usual crowd of trolls to claim:
1. BBC bias;
2. There were no chemical attacks;
3. They were false flags by the opposition;
4. The UK and US were wrong about WMD in Iraq;
5. The West uses CW too.
1. BBC bias;
2. There were no chemical attacks;
3. They were false flags by the opposition;
4. The UK and US were wrong about WMD in Iraq;
5. The West uses CW too.
