MSF-backed hospitals treated Syria 'chemical victims'
24 August 2013 Last updated at 22:24 BST
Medecins Sans Frontieres says hospitals it supports in Syria treated about 3,600 patients with "neurotoxic symptoms", of whom 355 have died.
It said the patients had arrived in three hospitals in the Damascus governorate on 21 August - when opposition activists say chemical attacks were launched against rebels.
Christopher Stokes, from MSF, said the organisation cannot "scientifically confirm" the use of chemical weapons.