Banned chlorine munitions were likely dropped on a Syrian neighbourhood in February, an international body on chemical weapons said.
Chemical weapons inspectors have returned from a mission to the Syrian town of Douma.
Russia is obstructing the access of international chemical weapons inspectors to the site of a suspected poison gas attack in the Syrian town of Douma.
Britain accused Russia of breaking the two-decade international ban on chemical weapons.
The United States and Syria appeared to offer conflicting accounts on Tuesday of whether global chemical weapons inspectors had reached the Syrian town of Douma.
Global chemical weapons inspectors finally reached the Syrian town on Tuesday where a suspected poison gas attack took place.
The Gulf Cooperation Council (GCC) supported on Saturday the U.S.-led air strikes against military targets belonging to the Syrian regime.
Egyptian officials warned on Saturday against the current international and regional polarization in Syria.
Russia said that most of the missiles launched Saturday by the Western states on Syria had been downed by Syria's air defenses.
Trump and his allies in Britain and France on Saturday hailed their joint surgical strikes in Syria over the regime's alleged use of chemical weapons.
Weapons inspectors aim to press ahead with plans to head to the site of a suspected chemical weapons attack in the Syrian town of Douma.
The United States on Friday blamed the Syrian government for a deadly chemical weapons attack this month and slammed Russia for failing to stop its ally.
Syrian government’s decision to again use chemical weapons meant they had “reached a point of no return”.
The world's chemical arms watchdog on Thursday confirmed Britain's findings on the identity of a nerve agent used on a former Russian spy.
Russian President Vladimir Putin spoke to Israeli Prime Minister Benjamin Netanyahu on Wednesday and urged him to do nothing to destabilise Syria.
Russia and the United States tangled on Tuesday at the United Nations over the use of chemical weapons in Syria.
Footage of the attack shared on social media shows piles of lifeless bodies in rooms, corridors and stairwells, with foam visible from their noses and mouths.
The UN Security Council was expected to vote on a 30-day extension of a UN-led investigation of chemical weapons attacks in Syria to allow for negotiations.
Russian ships participated in the removal of more than 1,100 tonnes of chemical weapons from Syria, Chief of Russia’s national defense coordination center.
U.S. President Trump urged all members of the U.N. Security Council to back the renewal of the international inquiry into chemical weapons attacks in Syria.