"In short the kind of device that conventional armies would not be interested in, but a militia group might just be. The area it hit, Khan al-Assal, has been in government hands since 17 March in an area where control often changes hands rapidly between the rebels and the Syrian Army. All sources we have spoken to say there is a pattern of victims suffering a variety of respiratory complaints from mild breathing difficulty, through fainting and vomiting to loss of consciousness and death. In most cases there were no signs of any conventional blast injuries in terms of external lacerations, burns or fractures, they say. Quite simply, one medical source connected to the hospital in Khan al-Assal said he has never seen anything like it. Let me stress again this is a war. All sides tell lies. I do not say any of this is credible or otherwise. But I do say that whatever Syria told the UN, the UN certainly found it credible enough to investigate. It is the most detailed account yet of what the Syrians believe happened." (thanks Samer)