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Protesters perform as victims and rescuers as they simulate a chemical attack during a demonstration against chemical attacks in Syria on April 6, 2017 on the Place de la Republique, in Paris. An air strike on rebel-held Khan Sheikhun in the northwestern province of Idlib on April 4, 2017 left scores of civilians dead from a suspected chemical weapons attack. At least 86 people -- among them 27 children -- were killed, with results from post-mortems performed on victims pointing to possible exposure to sarin, according to Turkish health officials. / AFP PHOTO / Zakaria ABDELKAFI (Photo credit should read ZAKARIA ABDELKAFI/AFP/Getty Images)

Protesters perform as victims and rescuers as they simulate a chemical attack during a demonstration against chemical attacks in Syria on April 6, 2017 on the Place de la Republique, in Paris.
An air strike on rebel-held Khan Sheikhun in the northwestern province of Idlib on April 4, 2017 left scores of civilians dead from a suspected chemical weapons attack. At least 86 people -- among them 27 children -- were killed, with results from post-mortems performed on victims pointing to possible exposure to sarin, according to Turkish health officials. / AFP PHOTO / Zakaria ABDELKAFI        (Photo credit should read ZAKARIA ABDELKAFI/AFP/Getty Images)