As “Operation Allies Welcome” reaches a key milestone, get the facts.

Some 100 people are reported dead and hundreds more injured in a chemical weapons attack on Tuesday in Syria’s northern Idlib province. Doctors at an IRC-supported hospital in the city of Idlib were able to save the lives of 10 people caught in the attack. 

From relentless bombings on hospitals, schools and homes to the hundreds of thousands recently uprooted in Idlib, Syria is struggling with the worst humanitarian catastrophe since the war began nine years ago.