IDLIB, SYRIA - APRIL 05: A poison hazard danger sign is seen in the town of Khan Shaykun, Idlib province, Syria on April 05, 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. (Photo by Abdussamed Dagul/Anadolu Agency/Getty Images)
