At least 40 people were killed and hundreds more were injured.
On Thursday, Russia's military said Douma has been brought under full control of the Syrian government under a Russia-mediated deal that secured the evacuation of the rebels and thousands of civilians after it was recaptured by Syrian forces.
According to a statement by the French presidency, Macron called for dialogue between France and Russia to "continue and intensify" to bring peace and stability to Syria. He cautioned that even if inspectors confirmed chemical weapons were used in Douma, "we will not know who did it". And our strategy remains the same as a year ago.
"No final decision has been made" on Syria, Sanders said. "But at the moment, the Russians do not want to be cheated anymore, and Putin does not seem to want to come up short".
Later Thursday he was noncommittal. We are looking very, very seriously, very closely at that whole situation.
Russian representative Vassily Nebenzia argued the incident in Douma was staged and that US military action in response could have "grave repercussions".
President Donald Trump just tweeted a warning that an attack on Syria is imminent - breaking his own policy of not signaling upcoming military moves. During the Obama administration and Medvedev's term, Washington received a very weak green light from the UN Security Council to destroy Libya.
The government, however, said evacuations were continuing and no Syrian government forces had entered the town. Initial reports indicated the use of chlorine gas, possibly in addition to the nerve agent Sarin. That's likely a reference to US smart bombs that, typically, can evade missile-defense systems and then precisely hit a target. Damascus has denied using chemical weapons.
There has been increasing controversy over whether the international community should get involved in increasing violence in Syria, which recently culminated in a suspected deadly gas attack.
Asked about the risks of US military retaliation, Mattis cited two concerns, starting with avoiding civilian casualties. It's widely reported that Ricky Waddell will step down as national security adviser - deputy national security adviser.
The support ships in tow are the guided missile cruiser USS Normandy and four destroyers: the USS Farragut, USS Bulkeley, USS Arleigh Burke and USS Forrest Sherman.
Russian electronic warfare tactics have been observed in past war zones like Ukraine and have recently shown signs of getting more advanced.
Kuwait Airways released the statement overnight, saying flights to Beirut would be suspended from Thursday until further notice.
Russian lawmakers have warned the United States that Moscow would view an airstrike on Syria as a war crime and that it could trigger a direct U.S-Russian military clash. It said the victims have been transferred to Tehran, and that funerals will be held in the victims' hometowns across the country.