Syria: The story of the conflict: Chemical attack
On 21 August 2013, footage emerged of victims of an suspected chemical weapons attack on several Damascus suburbs. Hundreds were killed, foreign governments and activists said.
Both sides blamed each other for the incident, potentially the deadliest of the conflict so far.
However, the US and its allies made it clear they believed the Syrian government used chemical weapons on its own people on a large scale, raising the possibility of punitive military strikes.
Disponível em: http://www.bbc.co.uk/news/world-middle-east-19331551
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