Keith surely you do not expect me to believe something just because it is in Wiki?
As an example of an OPCW report:
The release of sarin at Khan Shay khun on 4 April 2017.basically comes down to the sarin probably belonged to the Syrian Arab Republic.
The crater was probably formed by a bomb rather than IED
Syrian Arab aircraft were in the vicinity that day, therefore they are probably the guilty party.


Probably does not equate with unequivocally!

Extracted from United Nations /2017/904
Security Council
26 October 2017
Letter dated 26 October 2017 from the Secretary General
addressed to the President of the Security Council