However, there was no official announcement from Syria on the matter and there was also no indication of Syrian government forces entering the city Thursday.
Syria's President, Bashar al Assad, said a possible attack on his country could trigger regional instability.
The Times reports that "the largest U.S. air and naval strike force since the 2003 Iraq war" is now heading towards Syria, and that US-led strikes are expected to begin "within the next three days".
Lieutenant General Kenneth McKenzie said: "We believe that by hitting Barzeh in particular we've attacked the heart of the Syrian chemicals weapon program". The West swiftly pointed the finger at the Syrian government, which has denied all the accusations.
The allegations were followed by the White Helmets posting unverified footage of the aftermath of the alleged chemical weapons attack and claiming that up to 70 people had died of "widespread suffocation".
As tensions mount between the USA and Russian Federation over a possible U.S. strike, the Kremlin said a crisis communications link with the United States meant to avoid an accidental clash over Syria was being used by both sides. He added that it would have an "utterly destructive impact on the Syrian settlement".
Peskov wouldn't say if Moscow could use a Russian-U.S. military hotline to avoid escalation in the event of a U.S. strike, saying only that "the hotline exists and has remained active".More news: Britain attacks Syria with cruise missiles to deter more chemical attacks
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In Paris, France's Emmanuel Macron upped the pressure on Moscow by stating he had "proof" that the Assad's regime had used chemical weapons, and vowing a response "at a time of our choosing". "We'll be coming out of Syria, like, very soon", he said.
Amid the talk of military action, the Kremlin, a close ally of Assad, countered that more "serious approaches" were needed to combat the crisis.
She said repeated attempts to hold the Syrian regime to account had been met with Russian "obstruction and resistance".
Assad said Thursday that Western threats to strike Syria are based on "lies" and seek to undermine his forces' advances near Damascus.
Mrs May is expected to ask her cabinet to approve a form of British participation in action led by France and the USA, aimed at Syrian President Bashar al Assad's chemical weapons infrastructure.
His comments, made as he received Ali Akbar Velayati, foreign policy advisor to Iran's Supreme Leader Ayatollah Ali Khamenei, were posted on the Syrian presidency's social media accounts.
"Cabinet agreed on the need to take action to alleviate humanitarian distress and to deter the further use of chemical weapons..."