U.N. Probe Chief Doubtful on Syria Sarin Exposure Claims

"... The indication that the overwhelming majority in the sample had very little or no exposure to Sarin was particularly significant, because those in the sample had been chosen by local opposition authorities as being among the most serious affected survivors. The data suggest that the Syrian opposition and its external supporters had vastly exaggerated the scope and severity of the attack...."

... that leads us to the attack: it was, as many US & EUR intelligence officials & Sy Hersh have suggested: an insurgent/jihadis kitchen that went sour, with attempts to drag the US into an aggression!