1. The @OPCW was not able to access the sites until April 21, 2 weeks after the attack.
2. At this point Douma was firmly under the control of the Syrian govt which
3. By this time, the Syrian govt had buried the victims of the attack and
1. what else was occurring in Douma at the time of the attack
2. the similarity between the cylinders found in Douma and those used in previous chemical attacks
3. how the cylinders arrived at the scenes of the attack