Royal Air Force Typhoon fighter aircraft have joined forces with France's air force in a coordinated attack on an underground arms cache in Syrian territory operated by the Islamic State group (IS), per a report from the UK's MoD.
The location, located using surveillance, was assessed as housing weapons and explosive materials, the statement said, and was situated in mountains just north of the historic site of Palmyra in the heart of Syria.
"Our fighter planes used precision-guided Paveway IV munitions to strike a number of approach shafts leading to the depot... initial indications suggest the objective was successfully hit," officials stated.
There was no sign of any civilian impact in the attack late on Saturday and each participating jet returned safely, the MoD added.
The British jets were assisted by a Voyager refuelling tanker.
Daesh - alternatively referred to as ISIS - established militant control over large swathes of Syria and Iraq before its territorial defeat in 2019.
"This action underscores our UK leadership, and determination to stand shoulder to shoulder with our partners, to stamp out any re-emergence of Daesh and their violent and radical beliefs in the area," Britain's Defence Chief John Healey remarked.
UK warplanes have conducted surveillance missions over Syrian airspace to "deter any efforts to regroup" of IS after its routing at the Baghuz confrontation in 2019, the authorities noted.
"I extend gratitude to every member of our armed forces participating in this strike for their skill and their valour," the Defence Secretary said. "They were among thousands of British troops deployed over the holidays. This action, to remove terrorist threats who threaten our safety, highlights how our armed forces are always on standby, throughout the year, protecting the UK within its borders and influential overseas."
Last December, the American forces carried out what it called a "major assault" on Islamic State objectives in the country, after an assault resulted in the deaths of two US servicemembers and a civilian interpreter in Palmyra.
The United Nations says Daesh still boasts between 5,000 and 7,000 fighters in Syria and Iraq.
