Key facts on suspected chemical attacks in Syria

The latest fighting in Syria has seen an uptick in the alleged use of chemical weapons by the regime, including on the rebel-held enclave of Eastern Ghouta. The fresh violence has sparked wide concern and threats of military action from the United States. It was in the Eastern Ghouta enclave in August 2013 that a chemical attack, the biggest of any conflict in years, killed hundreds of people.

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