A French-Vietnamese journalist filed the lawsuit in 2014 against 14 firms that made or sold the highly toxic chemical for causing grievous harm to her and others.
The Organisation for the Prohibition of Chemical Weapons for the first time explicitly blamed the Syrian regime for chemical attacks using sarin and chlorine in 2017.
The Organisation for the Prohibition of Chemical Weapons (OPCW)'s investigation team, the formation of which was opposed by Moscow and Damascus, said more than 100 people were affected by the attacks, carried out in March 2017.
Inspectors from the Organization for the Prohibition of Chemical Weapons concluded in a report released that a toxic chemical containing chlorine was used in last year's attack in Douma.
The team established by the global chemical weapons watchdog will investigate nine alleged attacks during the country's civil war.
The Syrian regime has been accused of using chemical weapons, including in an alleged chlorine attack on north-west Syria on May 19. The regime has denied the allegations.
Syria’s future remains uncertain as warring sides trade allegations ahead of a meeting to form a crucial constitutional committee meant to bring a democratic transition.
Initial findings by the OPCW into a suspected chemical attack in the Syrian town of Douma indicate that chlorine may have been used but that there were no indications that a nerve agent was used in the April 7 attack.
But the decision has angered Russia, Iran and Syria, with Russia strongly hinting that it may withdraw from the international body.
At least 20 people were killed in the attack. The chemical weapons agency has not named a perpetrator, but witnesses say the chemicals were dropped on the rebel-held area from helicopters known to belong to the Syrian regime forces.
But Syria's UN ambassador refuted regime media reports that chemical inspectors had entered Douma, saying that UN security experts were preparing the way for the OPCW inspectors to look into alleged attack.
As the US announced the new measures investigators were set to begin their work in investigating the chemical attack in Douma that prompted US-led airstrikes over the weekend.
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