Britain has fully supported the US decision with Sir Michael Fallon saying it was a “limited, appropriate and narrowly focused action”.
The UK Defence Secretary said this morning “there have been extensive consultations in Washington and London”.
He told Good Morning Britain: “We are backing it. We fully support this strike.
"It was used to deter President Assad from carrying out future attacks and we fully support that."
Sir Michael Fallon told Sky News: “We’ve been in close contact with the US government over the last couple of days.
“One the President made his decision the defence secretary called me again to give us advance notice of the strike and the PM has been kept informed throughout.“
Sir Michael Fallon said Theresa May was kept fully informed of the US' plans
This is the first time this has happened during the Trump administration and they decided they want to help deter it in the future
Sir Michael Fallon
Mr Fallon said the Assad regime has committed previous gas attacks “flouting international law”.
He said: “This is the first time this has happened during the Trump administration and they decided they want to help deter it in the future.”
Liberal Democrats leader Tim Farron came out strong on the strikes, calling for Britain to take action.
He said: "The attack by American forces was a proportionate response to the barbarous attack by the Syrian government on its own people.
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"The British government rather than just putting out a bland statement welcoming this should now follow it up and call an emergency meeting of the Nato alliance to see what else can be done, be that more surgical strikes or no fly zones.
"Evil happens when good people do nothing, we cannot sit by while a dictator gasses his own people. We cannot stand by, we must act."
A Government spokesperson said: “Overnight, the US has taken military action against the Syrian regime, targeting the airfield in Shayrut which was used to launch the chemical weapons attack earlier this week.
“The UK Government fully supports the US action, which we believe was an appropriate response to the barbaric chemical weapons attack launched by the Syrian regime, and is intended to deter further attacks.”
The moment Trump launched 59 missiles against Syria Fri, April 7, 2017
U.S. President Donald Trump launched 59 Tomahawk missiles against Syria in response to its chemical attack on its own civilians
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Trump ordered a massive military strike against a Syria
The US launched 59 Tomahawk missiles on a Syrian airfield after Bashar al-Assad was accused of killing civilians with chemical weapons in a murderous gas attack.
The air assault was launched from the USS Porter and USS Ross in the Mediterranean.
In a statement, President Trump said: “Tonight I ordered a targeted military strike on the military airfield in Syria from where the chemical attack was launched.
“It is in the vital national security interests of the United States to prevent the spread and use of chemical weapons.
"There can be no dispute that Syria used banned chemical weapons, violated its obligations under the Chemical Weapons Convention, and ignored the urging of the U.N. Security Council."
The decision to take out the Al-Shayrat Air Base, the base from which the chemical attack on Syria’s Idlib province was reportedly launched is widely supported in Britain and around the world.
In Russia however, the strike was met with fury.
Putin's Government has said Trump has undermined strategic missions from Moscow.
The British Government has said the US response was 'appropriate'
Former leader of the Lib Dems Paddy Ashdown said on Twitter: “Trump's cruise attack.
“The right thing to do. Now we'll see if he can match action with restraint in the follow through.
“Moscow's move next.”
More to follow…