BREAKING: The United States, France, and the UK have launched airstrikes on Syria.

US, British and French forces have hammered Syria with air strikes in response to a poison gas attack that killed dozens of people last week, in the biggest intervention by Western powers in Syria’s civil war.

US President Donald Trump announced the military action from the White House late on Friday. As he spoke, explosions rocked Damascus.

Trump said he was prepared to sustain the response until the government of Syrian President Bashar al-Assad stopped its use of chemical weapons.

The intervention was the biggest strike by Western powers against Assad in the country’s seven-year-old civil war and pitted the United States and its allies against Russia, which itself intervened in the war in 2015 to back Assad.

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“A short time ago, I ordered the United States Armed Forces to launch precision strikes on targets associated with the chemical weapons capabilities of Syrian dictator Bashar al-Assad,” Trump said in a televised address from the White House.

A US official told Reuters the strikes were aimed at multiple targets and involved Tomahawk cruise missiles.

At least six loud explosions were heard in Damascus in the early hours of Saturday and smoke was seen rising over the Syrian capital, a Reuters witness said.

A second witness said the Barzah district of Damascus had been hit in the strikes. Barzah is the location of a major Syrian scientific research centre.

Speaking of Assad and his suspected role in last week’s chemical weapons attack, Trump said: “These are not the actions of a man. They are crimes of a monster instead.”

“The purpose of our actions tonight is to establish a strong deterrent against the production, spread and use of chemical weapons,” Trump said.

The US president also criticised both Russia and Iran, which have backed Assad’s government.

“To Iran and to Russia, I ask, what kind of a nation wants to be associated with the mass murder of innocent men, women and children?” Trump said.

British Prime Minister Theresa May said she had authorised British armed forces “to conduct co-ordinated and targeted strikes to degrade the Syrian regime’s chemical weapons capability.”

“This is not about intervening in a civil war. It is not about regime change,” May said in a statement.

“It is about a limited and targeted strike that does not further escalate tensions in the region and that does everything possible to prevent civilian casualties.”

French President Emmanuel Macron said the attack would be limited to Syria’s chemical weapons facilities.

“We cannot tolerate the recurring use of chemical weapons, which is an immediate danger for the Syrian people and our collective security,” a statement from the Elysee presidential office said.