The US military launched cruise missile strikes ordered by President Donald Trump against a Syrian air base controlled by President Bashar al-Assad's forces in response to a deadly chemical attack in a rebel-held area, a US official says.
Facing his biggest foreign policy crisis since taking office in January, Trump took the toughest direct US action yet in Syria's six-year-old civil war, raising the risk of confrontation with Russia and Iran, Assad's two main military backers.
Some 50 Tomahawk missiles were launched from US Navy warships in the Mediterranean Sea, the US official said, speaking on condition of anonymity. A target was identified as an air base in Homs. Further details on the target and the results of the strikes were not immediately known.
Trump ordered the strikes just a day after he pointed the finger at Assad for this week's chemical attack, which killed at least 70 people, many of them children, in the Syrian town of Khan Sheikhoun. The Syrian government has denied it was behind the attack.
Trump, who was attending a summit with Chinese President Xi Jinping at his Florida resort, said earlier on Thursday that "something should happen" with Assad as the White House and Pentagon studied military options.
US military action put the new president at odds with Russia, which has air and ground forces in Syria after intervening there on Assad's side in 2015 and turning the tide against mostly Sunni Muslim rebel groups.
Trump has until now focused his Syria policy almost exclusively on defeating Islamic State militants in northern Syria, where US special forces are supporting Arab and Kurdish armed groups.
The risks have grown worse since 2013, when Barack Obama, Trump's predecessor, considered and then rejected ordering a cruise missile strike in response to the use of chemical weapons by Assad's loyalists.