Royal Air Force Typhoon fighter aircraft have operated alongside French warplanes in a coordinated attack on an underground arms cache in Syria operated by the Islamic State group (IS), per a report from the UK's MoD.
The location, identified by reconnaissance, was thought to be containing munitions and bombs, the statement said, and was situated in mountainous terrain just north of the ancient city of Palmyra in the heart of Syria.
"Our fighter planes used laser-guided Paveway IV weapons to hit a series of access tunnels leading to the facility... preliminary assessments indicate the objective was successfully hit," the MoD said.
There was no evidence of any harm to civilians in the attack late on Saturday and every plane involved returned to base without incident, the MoD added.
The Typhoon fighters were backed up by a Voyager tanker plane.
IS - also known as Daesh - imposed extremist governance over large swathes of Iraq and Syria until 2019.
"This action demonstrates British leadership, and commitment to work closely with allied nations, to stamp out any re-emergence of IS and their violent and radical beliefs in the region," the British Defence Secretary the minister said.
RAF aircraft have carried out patrols over Syrian airspace to "prevent any attempted comeback" of the group subsequent to its military defeat at the Baghuz confrontation in 2019, the ministry said.
"I extend gratitude to all the members of British forces participating in this strike for their expertise and their bravery," he added. "They were part of a great many British troops on duty over Christmas and New Year. This mission, to eliminate dangerous terrorists who endanger our safety, highlights how British military are ready to step up, all year round, ensuring Britain's security domestically and powerful internationally."
Last December, the American forces conducted what it called a "large-scale strike" against Daesh sites in Syria, after an ambush resulted in the deaths of two American soldiers and a civilian linguist in Palmyra.
The United Nations estimates Daesh still has an estimated 5,000 to 7,000 militants in both countries.
