There was no Sarin attack by government planes in Khan Sheikhoun (Khan Shaykhun) on April 4th 2017.
Read two very interesting reports by top scientists. Both are fairly long but are well worth the time taken to read them.
The first one deals with the lack of biological evidence to support the claim of Sarin poisoning. The second one deals with the evidence of the delivery of the supposed Sarin, showing that it was neither dropped nor fired from a Sukhoi-22.
Firstly, Dr Denis O’Brien, who has a PhD in Neuroscience, trained in neuropharmacology and has 20 years experience of teaching and doing research in the neurosciences.
Secondly, Professor Theodore Postol, a professor emeritus of Science, Technology, and International Security at the Massachusetts Institute of Technology.