IDLIB, SYRIA - MAY 01: A Syrian kid receives treatment at a hospital following a suspected chlorine gas attack by Assad regime forces in Idlib, Syria on May 01, 2015. (Photo by Stringer/Anadolu Agency/Getty Images)
IDLIB, SYRIA - MAY 03: A Syrian man receives treatment at a field hospital following a suspected chlorine gas attack by Assad regime forces in Idlib, Syria on May 03, 2015. (Photo by Firas Taki/Anadolu Agency/Getty Images)
DAMASCUS, SYRIA - JULY 30: A Syrian man receives treatment at a field hospital following a chlorine gas attack by Assad regime forces in Jobar town of Damascus, Syria on July 30, 2015. (Photo by Ammar Sulaiman/Anadolu Agency/Getty Images)
IDLIB, SYRIA - MAY 01: A Syrian kid receives treatment at a hospital following a suspected chlorine gas attack by Assad regime forces in Idlib, Syria on May 01, 2015. (Photo by Stringer/Anadolu Agency/Getty Images)
