This is the story of a town called Douma ... and of an underground clinic whose images of suffering allowed three of the Western world's most powerful nations to bomb Syria last week. When I track [a doctor] down in the very same clinic, [he] tells me that the gas" videotape which horrified the world - despite all the doubters - is perfectly genuine. The same 58-year old senior Syrian doctor then adds something profoundly uncomfortable: the patients, he says, were overcome not by gas but by oxygen starvation in the rubbish-filled tunnels and basements in which they lived. Dr Rahaibani ... showed me his lowly hospital and the few beds where a small girl was crying as nurses treated a cut above her eye. "All the doctors know what happened. There was a lot of shelling [by government forces] and aircraft were always over Douma at night - but on this night, there was wind and huge dust clouds began to come into the basements and cellars where people lived. People began to arrive here suffering from hypoxia, oxygen loss. Then someone at the door, a "White Helmet", shouted "Gas!", and a panic began. People started throwing water over each other. Yes, the video was filmed here, it is genuine, but what you see are people suffering from hypoxia - not gas poisoning." Oddly, after chatting to more than 20 people, I couldn't find one who showed the slightest interest in Douma's role in bringing about the Western air attacks. Two actually told me they didn't know about the connection.