Guys, give us one piece of data that suggests the gas attack was not perpetrated by the SAA.
Don't hold your breath . . .
First the Russians claim that the attack was on a rebel-held military depot. How could they know without examining the site? Now Assad claims that the attacks were "100 per cent fabricated", using fake video evidence, contradicting the Russian claim. Amnesty International has authenticated video evidence shot in the aftermath.
Then Russia vetoes a UN resolution into an investigation into the attack.
Yet people are still prepared to completely ignore or refute the simplest and most obvious explanation.