Timeline of chemical weapons use in Syria

BEIRUT (AP) — Chemical weapons have killed hundreds of people since the start of Syria’s civil war, with the U.N. blaming three attacks on the Syrian government and a fourth on the Islamic State group.
Syrian rebels and opposition activists say pro-government forces have used chemical weapons and bombs containing chlorine on numerous occasions. They say a chemical weapons attack on a town in northern Syria on Tuesday killed dozens of people. The Syrian government has denied ever usi