(01 of18)
Open Image Modal (credit:Getty Images)
(02 of18)
Open Image ModalA wounded child receives medical treatment at Sahra hospital after the Assad regime forces attacked with chlorine gas in the town of Khan Sheikhoun in Idlib, Syria on April 4, 2017. (credit:Anadolu Agency via Getty Images)
(03 of18)
Open Image ModalA child gets treatment at a hospital after Assad regime forces attacked with suspected chlorine gas. (credit:Anadolu Agency via Getty Images)
(04 of18)
Open Image ModalA civil defence member breathes through an oxygen mask, after what rescue workers described as a suspected gas attack in the town of Khan Sheikhoun in rebel-held Idlib, Syria April 4, 2017. (credit:Ammar Abdullah / Reuters)
(05 of18)
Open Image ModalCivil defense members try to reduce the effects of chlorine gas with water as they carry out search and rescue efforts after a gas attack in Syria. (credit:Anadolu Agency via Getty Images)
(06 of18)
Open Image ModalA wounded child waits for treatment at a hospital after Assad Regime forces attacked with chlorine gas to the town of Khan Sheikhoun in Idlib, Syria. (credit:Anadolu Agency via Getty Images)
(07 of18)
Open Image ModalChildren get treatment at a hospital. (credit:Anadolu Agency via Getty Images)
(08 of18)
Open Image ModalA man carries the body of a dead child, after what rescue workers described as a suspected gas attack in the town of Khan Sheikhoun in rebel-held Idlib, Syria on April 4, 2017. (credit:Ammar Abdullah / Reuters)
(09 of18)
Open Image ModalBodies of chlorine gas victims are seen after Assad regime forces attacked with chlorine gas. (credit:Anadolu Agency via Getty Images)
(10 of18)
Open Image ModalA still image taken from a video posted to a social media website on April 4, 2017, shows people lying on the ground said to be in the town of Khan Sheikhoun, after what rescue workers described as a suspected gas attack in rebel-held Idlib, Syria. (credit:Handout/Reuters)
Assad Regime's suspected chemical attack(11 of18)
Open Image ModalIDLIB, SYRIA - APRIL 6 : A chemical gas attack survivor, receives medical treatment at an hospital in Idlib, Syria on April 6, 2017. On Tuesday more than 100 civilians had been killed and 500 others, mostly children, injured in Assad Regime\'s suspected chlorine gas attack carried out by warplanes in the town of Khan Shaykun, Idlib province.\n (Photo by Huseyin Fadil/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Assad Regime's suspected chemical attack(12 of18)
Open Image ModalIDLIB, SYRIA - APRIL 6 : A chemical gas attack survivor, receives medical treatment at an hospital in Idlib, Syria on April 6, 2017. On Tuesday more than 100 civilians had been killed and 500 others, mostly children, injured in Assad Regime\'s suspected chlorine gas attack carried out by warplanes in the town of Khan Shaykun, Idlib province.\n (Photo by Huseyin Fadil/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Assad Regime's suspected chemical attack(13 of18)
Open Image ModalIDLIB, SYRIA - APRIL 6 : A chemical gas attack survivor 6-year-old Seyma Suveydani, receives medical treatment at an hospital in Idlib, Syria on April 6, 2017. On Tuesday more than 100 civilians had been killed and 500 others, mostly children, injured in Assad Regime\'s suspected chlorine gas attack carried out by warplanes in the town of Khan Shaykun, Idlib province.\n (Photo by Huseyin Fadil/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Assad Regime's suspected chemical attack(14 of18)
Open Image ModalIDLIB, SYRIA - APRIL 6 : Chemical gas attack survivors, receives medical treatment at an hospital in Idlib, Syria on April 6, 2017. On Tuesday more than 100 civilians had been killed and 500 others, mostly children, injured in Assad Regime\'s suspected chlorine gas attack carried out by warplanes in the town of Khan Shaykun, Idlib province.\n (Photo by Huseyin Fadil/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
MIDEAST-CRISIS/SYRIA-IDLIB(15 of18)
Open Image ModalA man breathes through an oxygen mask, after what rescue workers described as a suspected gas attack in the town of Khan Sheikhoun in rebel-held Idlib, Syria April 4, 2017. REUTERS/Ammar Abdullah (credit:Ammar Abdullah / Reuters)
MIDEAST-CRISIS/SYRIA-IDLIB(16 of18)
Open Image ModalA man breathes through an oxygen mask as another one receives treatments, after what rescue workers described as a suspected gas attack in the town of Khan Sheikhoun in rebel-held Idlib, Syria April 4, 2017. REUTERS/Ammar Abdullah (credit:Ammar Abdullah / Reuters)
Assad Regime's suspected chemical attack(17 of18)
Open Image ModalIDLIB, SYRIA - APRIL 6 : A chemical gas attack survivor Ismail Reslan, receives medical treatment at an hospital in Idlib, Syria on April 6, 2017. On Tuesday more than 100 civilians had been killed and 500 others, mostly children, injured in Assad Regime\'s suspected chlorine gas attack carried out by warplanes in the town of Khan Shaykun, Idlib province.\n (Photo by Huseyin Fadil/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Assad Regime's suspected chemical attack(18 of18)
Open Image ModalIDLIB, SYRIA - APRIL 6 : A chemical gas attack survivor Muhammed Suhayb, receives medical treatment at an hospital in Idlib, Syria on April 6, 2017. On Tuesday more than 100 civilians had been killed and 500 others, mostly children, injured in Assad Regime\'s suspected chlorine gas attack carried out by warplanes in the town of Khan Shaykun, Idlib province.\n (Photo by Huseyin Fadil/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)