21 August 2013
Updated at 13:31 ET
Syria conflict: 'Chemical attacks kill hundreds'
The BBC's Frank Gardner says the footage shows people gasping for breath and convulsing
Syria conflict
In pictures: 'Chemical attacks'
City where snipers shoot children
Kurdish-jihadist clashes
Khalidiya 'setback, but no defeat'
Chemical weapons attacks have killed hundreds on the outskirts of Damascus, Syrian opposition activists say.
link-
http://www.bbc.co.uk/news/world-middle-east-23777201