(01 of12)
Open Image ModalIDLIB, SYRIA - APRIL 4: Bodies of chlorine gas victims are seen after Assad Regime forces attacked with chlorine gas to Khan Shaykhun town of Idlib, Syria on April 4, 2017. (Photo by Sadduldin Zaidan /Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
(02 of12)
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. REUTERS/Ammar Abdullah (credit:Ammar Abdullah / Reuters)
(03 of12)
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)
(04 of12)
Open Image ModalIDLIB, SYRIA - APRIL 4: A wounded kid receives medical treatment at sahra hospital after Assad Regime forces's attack with chlorine gas to Khan Shaykhun town of Idlib, Syria on April 4, 2017. (Photo by Abdulghani Arian/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
(05 of12)
Open Image ModalIDLIB, SYRIA - APRIL 4: A wounded kid waits for the treatment at sahra hospital after Assad Regime forces's attack with chlorine gas to Khan Shaykhun town of Idlib, Syria on April 4, 2017. (Photo by Abdulghani Arian/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
(06 of12)
Open Image ModalIDLIB, SYRIA - APRIL 4: Wounded kids wait for the treatment at sahra hospital after Assad Regime forces's attack with chlorine gas to Khan Shaykhun town of Idlib, Syria on April 4, 2017. (Photo by Abdulghani Arian/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
(07 of12)
Open Image ModalIDLIB, SYRIA - APRIL 4: (EDITORS NOTE: Image depicts death) Body of a baby is seen after Assad Regime forces's attack with chlorine gas to Khan Shaykhun town of Idlib, Syria on April 4, 2017. (Photo by Firas Faham/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
(08 of12)
Open Image ModalA Syrian man receives treatment following a suspected toxic gas attack in Khan Sheikhun, a rebel-held town in the northwestern Syrian Idlib province, on April 4, 2017.Warplanes carried out a suspected toxic gas attack that killed at least 35 people including several children, a monitoring group said. The Syrian Observatory for Human Rights said those killed in the town of Khan Sheikhun, in Idlib province, had died from the effects of the gas, adding that dozens more suffered respiratory problems and other symptoms. / AFP PHOTO / Mohamed al-Bakour (Photo credit should read MOHAMED AL-BAKOUR/AFP/Getty Images) (credit:MOHAMED AL-BAKOUR via Getty Images)
(09 of12)
Open Image ModalA Syrian man in taken by civil defence workers following a suspected toxic gas attack in Khan Sheikhun, a rebel-held town in the northwestern Syrian Idlib province, on April 4, 2017. Warplanes carried out a suspected toxic gas attack that killed at least 35 people including several children, a monitoring group said. The Syrian Observatory for Human Rights said those killed in the town of Khan Sheikhun, in Idlib province, had died from the effects of the gas, adding that dozens more suffered respiratory problems and other symptoms. / AFP PHOTO / Mohamed al-Bakour (Photo credit should read MOHAMED AL-BAKOUR/AFP/Getty Images) (credit:MOHAMED AL-BAKOUR via Getty Images)
(10 of12)
Open Image ModalA Syrian man receives treatment following a suspected toxic gas attack in Khan Sheikhun, a rebel-held town in the northwestern Syrian Idlib province, on April 4, 2017. Warplanes carried out a suspected toxic gas attack that killed at least 35 people including several children, a monitoring group said. The Syrian Observatory for Human Rights said those killed in the town of Khan Sheikhun, in Idlib province, had died from the effects of the gas, adding that dozens more suffered respiratory problems and other symptoms. / AFP PHOTO / Mohamed al-Bakour (Photo credit should read MOHAMED AL-BAKOUR/AFP/Getty Images) (credit:MOHAMED AL-BAKOUR via Getty Images)
(11 of12)
Open Image ModalA Syrian child receives treatment following a suspected toxic gas attack in Khan Sheikhun, a rebel-held town in the northwestern Syrian Idlib province, on April 4, 2017. Warplanes carried out a suspected toxic gas attack that killed at least 35 people including several children, a monitoring group said. The Syrian Observatory for Human Rights said those killed in the town of Khan Sheikhun, in Idlib province, had died from the effects of the gas, adding that dozens more suffered respiratory problems and other symptoms. / AFP PHOTO / Mohamed al-Bakour (Photo credit should read MOHAMED AL-BAKOUR/AFP/Getty Images) (credit:MOHAMED AL-BAKOUR via Getty Images)
(12 of12)
Open Image ModalIDLIB, SYRIA - APRIL 4: Children get treatment at a hospital after Assad Regime forces attacked with chlorine gas to Khan Shaykhun town of Idlib, Syria on April 4, 2017. (Photo by Mohammed Karkas/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)