File:Douma chlorine house via Kyodo News.jpg


 * Source
 * Questions over gas cylinder remain after Syria attack - Kazuhiro Kimura, Kyodo News, April 20, 2018
 * Attack on civilians in Syria - Getty Images, April 20, 2018
 * ''People gather in front of an apartment building in Douma, a suburb of Damascus, on April 16, 2018, where chemical weapons were suspected to have been used against civilians. ==Kyodo