The OPCW's conclusions were based on environmental samples, witness interviews and other data gathered by members of a fact-finding mission that visited a number of sites in Douma two weeks after the attack.
Baaritaanka hay'adda OPCW waxa uu ku saleysnaa tijaabooyin laga soo qaaday deegaannada uu weerarka ka dhacay, wareeysiyo dad goob-joogeyaal ahaa iyo baaritaanno kale oo ay sameeyeen xubno ka tirsan guddiga xaqiiqa raadinta oo laba toddobaad ka dib booqday dhawr goobood oo ka tirsan magaalada Douma.