Mustard gas was used in an attack on a town in northern Syria in August, chemical weapons experts have concluded.
The Organization for the Prohibition of Chemical Weapons (OPCW) said the chemical agent was used in the town of Marea.
Islamic State (IS) militants were accused of using mustard gas during fighting with a local rebel group.
The OPCW report said a baby “very likely” died as a result of its use.
Medecins Sans Frontieres (MSF) said at the time of the 21 August attack that it had treated four members of a family who were suffering from breathing difficulties and had developed blisters after a mortar hit their Marea home.
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