The Organisation for the Prohibition of Chemical Weapons (OPCW) reported that the toxic chemical used in Douma, was likely molecular chlorine.

Despite being given the power to assign blame by its member states last June, the OPCW investigation did not do so for the Douma attack, as it was not part of the mandate for the team investigating the April attack.

The OPCW is the intergovernmental organization responsible for implementing the Chemical Weapons Convention.

Weaponizing chlorine is prohibited under the Convention, ratified by Syria in 2013, and is prohibited under customary international humanitarian law.

The last rebel-held suburb of Damascus was being beseiged by Syrian forces in April 2018. Dozens of civilians were killed in the attack.

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