In a press conference on Saturday morning, Prime Minister Theresa May said "I can't tell you everything" but insisted all evidence points to Assad.
In the moments after President Donald Trump ordered coordinated attacks on chemical weapons facilities in Syria, the White House sent a briefing document to members of Congress prepared by the National Security Council outlining the thinking behind its air strikes. Could not have had a better result.
His choice of words recalled a similar claim associated with President George W. Bush following the US -led invasion of Iraq.
"Today, the nations of Britain, France and the United States of America have marshalled their righteous power against barbarism and brutality", Trump said. The U.N. Security Council was meeting at Moscow's request.
McKenzie identified the targets as Barzah Research and Development, the Him Shinshar Chemical Weapons Storage Site and the Him Shinshar Bunker Facility.
Calling the airstrikes as "act of aggression", the Russian leader said Saturday that strikes had a "destructive influence on the entire system of worldwide relations" and will exacerbate humanitarian catastrophe in Syria, the Associated Press reported.
Trump did not provide details on the joint U.S. -British-French attack, but it was expected to include barrages of cruise missiles launched from outside Syrian airspace. He added the USA did not rule out that sarin gas was used as well.
So much for Trump's vow of a "sustained response", said Benham Ben Taleblu, a foreign-policy and security analyst with the Foundation for Defense of Democracies in Washington.
The military campaign was in response to a devastating chemical attack in the rebel-controlled Damascus suburb of Douma, which killed dozens of people earlier this month. Syria has denied the accusation. "Such attacks will not deter our armed forces and allied forces from persisting to crush what is left of the armed terrorist groups", the military said.
The Russian embassy in the U.S.
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British Prime Minister Theresa May said the attack "sends a clear message that the worldwide community will not stand by and tolerate the use of chemical weapons".
He further noted that his country "recommends and encourages a political solution to solve the Syrian crisis", stressing that "military action would only deepen the conflict in this Middle Eastern nation". That did not mean military strikes would continue; in fact, Gen. Joseph Dunford, chairman of the Joint Chiefs of Staff, said no additional attacks were now planned.
Russian leader Vladimir Putin reaffirmed the Kremlin's skepticism about the allies' Douma claim, saying Russian military experts had found no trace of the attack. Tehran also slammed the US's decision of launching air strikes in Syria.
The attack destroyed a building that includes a learning centre and laboratories, state TV said.
He added: "Insulting the president of Russian Federation is unacceptable and inadmissible".
"But we have to make it clear to the Syrian regime there is a effect of using chemical weapons".
- A barrel bomb was used to deliver the chemicals, a weapon that the rebels do not use.
The message, Schanzer said, is: "Don't launch chemical weapons".
"This aggression will only make Syria and its people more determined to keep fighting and crushing terrorism in every inch of the country", he said in comments published by his office.
Syria's foreign ministry said the strikes aimed to block their work. But the description from an ally put things differently.
"And they have had a very significant impact in degrading their ability to use chemical weapons in the future".