Robert Fisk, in The Independent, 15 April 2018, with this title “The search for truth in the rubble of Douma – and one doctor’s doubts over the chemical attack”
This is the story of a town called Douma, a ravaged, stinking place of smashed apartment blocks – and of an underground clinic whose images of suffering allowed three of the Western world’s most powerful nations to bomb Syria last week. There’s even a friendly doctor in a green coat who, when I track him down in the very same clinic, cheerfully tells me that the “gas” videotape which horrified the world – despite all the doubters – is perfectly genuine.
an image from another source -viz. The Guardian …
War stories, however, have a habit of growing darker. For 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, on a night of wind and heavy shelling that stirred up a dust storm.
http://www.alamy.com/stock-photo-the-purple-plain-1954-gfdtwo-cities-film-with-gregory-peck-19484850.html from 
