At this scientific site it should be possible to get some better informed considerations than I am finding elsewhere about the probabilities concerning what has happened in Syria. There appears little doubt that a population has suffered an attack involving probably sarin, and I think mustard gas has been mentioned. But then there have been doubts, indeed polemics, about who did the attack. The published US Government assessment . http://www.whitehouse.gov/the-press...n-government-s-use-chemical-weapons-august-21 does not identify a smoking gun. The forthcoming UN inspectors' report is not expected to try and identify the attacker. But it may contain indications from which we could reason out probabilities. In all the polemics I have seen so far (outside this site) the opinion of everyone appears determined by their political orientation and loyalties and what they want to be true, what they would like, or would best suit them, to be true. I would like to hear something more fact and knowledge-based here. For me a crucial part would be this paragraph: Syrian chemical weapons personnel were operating in the Damascus suburb of ‘Adra from Sunday, August 18 until early in the morning on Wednesday, August 21 near an area that the regime uses to mix chemical weapons, including sarin. On August 21, a Syrian regime element prepared for a chemical weapons attack in the Damascus area, including through the utilization of gas masks. Our intelligence sources in the Damascus area did not detect any indications in the days prior to the attack that opposition affiliates were planning to use chemical weapons. Mixing? I know that modern chemical weapons are designed to be binary, i.e. the toxic agent is not carried about as such, but created by mixing precursors. Maybe they are mixed when needed or soon before? That implies well trained and officered troops, and implicates the regular army surely? Or regular units that have switched sides. However the document just says 'mixing' without explanation. As if everyone knew about it. Any comments? Then I read in Wikipedia that, I don't know how usually, the mixing takes place inside the projectile shell. That implies that it is the side which has artillery, pretty much only the government side and it has certainly used it a lot. The idea of binary weapons is safer storage. Can we infer that this has not been an accident? Or could the estimated 1,400 deaths from accidental shelling of storage facility and is just a fraction as dreadful as it cluld hve been with more primitive weapons?