After the start of Syria’s uprising in 2011, the forces of President Bashar Assad, who was ousted last year, carried out 217 chemical attacks, according to the Syrian Network for Human Rights.
These include the major chemical massacre in Eastern Ghouta and Muadhamiyat al-Sham of Aug. 21, 2013, which killed more than 1,400 civilians, including hundreds of women and children, and injured more than 10,000 others.