Earlier Saturday, British Prime Minister Theresa May said that she has authorised the United Kingdom armed forces to conduct "coordinated and targeted strikes" in response to alleged chemical weapons attack in the Syrian town of Douma earlier this month.
Four Royal Air Force Tornado jets from the Akrotiri base in Cyprus fired Storm Shadow missiles at a military facility near Homs where it was assessed that Syria had stockpiled chemicals, Britain's Ministry of Defence said.
May said the aim was to deter the Syrian authorities from further use of chemical weapons and to send a message to the wider world that it was unacceptable to use such weapons. He warned that intervention would lead to a proxy war with Russian Federation which would be "not only risky to Britain, but the entire world".
"Important infrastructure was destroyed which will result in a setback for the Syrian regime", Mattis said.
May said intelligence and open source accounts indicated that the regime was behind the attack in Douma last Saturday.
The three countries consulted and collaborated on an assault in which more than a 100 missiles, reportedly targeting specific sites, were launched into Syria after the government was accused of a chemical attack.
May added Britain and its allies had sought to use every diplomatic means to stop the use of chemical weapons, but had been repeatedly thwarted, citing a Russian veto of an independent investigation into the Douma attack at the U.N. Security Council this week.
Trump said he has ordered "precision strikes" against Syria, where dozens of people were killed last weekend in a suspected toxic gas attack on Douma, the largest town in a former rebel stronghold outside Damascus.
The Western missile strikes demonstrate the volatile nature of the Syrian civil war, which started in March 2011 as an anti-Assad uprising but is now a proxy conflict involving a number of world and regional powers and a myriad of insurgent groups. "This massacre was a significant escalation in a pattern of chemical weapons use by that very awful regime", Trump alleged.
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But she added that the USA was "determined to completely crush" the Islamic State group and prevent its return. Macron says he changed Trump's mind in a phone call before the airstrikes on Friday night.
"This collective action sends a clear message that the global community will not stand by and tolerate the use of chemical weapons", May told a press conference.
"This is the first time as prime minister that I have had to take the decision to commit our armed forces in combat -- and it is not a decision I have taken lightly".
"I have done so because I judge this action to be in Britain's national interest".
However, May is facing questions over the legality of committing United Kingdom forces to any US -led attack on Syria.
May held an emergency cabinet meeting to discuss possible action on Thursday and there had been calls for the British parliament to be consulted before any air strikes.
"We are reassured that the military action is strictly targeted and limited in its objective".
Meanwhile, Britain's main opposition Labour leader Jeremy Corbyn described the US -led military strikes on Syria jointly staged by three leading Western countries as a "legally questionable action", saying that the British government should "not taking instructions from Washington".
"It was both right and legal to take military action together with our closest allies to alleviate further humanitarian suffering by degrading the Syrian regime's chemical weapons capability", May said.
He reiterated that Canada condemns the use of chemical weapons in Ghouta.