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IDLIB, SYRIA - APRIL 05: A chemical gas attack survivor man holds a perished chicken 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 Ogun Duru/Anadolu Agency/Getty Images)

IDLIB, SYRIA - APRIL 05: A chemical gas attack survivor man holds a perished chicken 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 Ogun Duru/Anadolu Agency/Getty Images)