British Air Force Typhoon FGR4s have conducted a mission with France's air force in a coordinated attack on an underground arms cache in Syria used by the Islamic State group (IS), according to the British defence ministry.
The site, pinpointed through intelligence, was assessed as housing weapons and explosive materials, the statement said, and was located in hills just north of the historic site of Palmyra in the heart of Syria.
"The RAF jets utilized laser-guided Paveway IV weapons to hit a several entry passages providing entry to the depot... preliminary assessments are that the strike was effective," the MoD said.
There was no indication of any civilian impact in the operation late on Saturday and each participating jet returned to base without incident, the defence officials confirmed.
The British jets were backed up by a Voyager refuelling tanker.
The Islamic State group - also known as the so-called Islamic State - imposed jihadist rule over large swathes of both Syria and Iraq prior to its 2019 collapse.
"This strike shows 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 area," the British Defence Secretary the minister said.
RAF aircraft have performed patrols over Syria to "forestall any attempted comeback" of the group subsequent to its defeat at the climactic battle in Baghuz in 2019, the authorities noted.
"I want to thank all the members of the UK armed forces participating in this strike for their professionalism and their bravery," he commented. "They were among thousands of UK service members deployed over Christmas and New Year. This action, to eliminate dangerous terrorists who endanger our way of life, shows how our armed forces are always on standby, all year round, keeping Britain secure within its borders and influential overseas."
In December, the American forces conducted what it termed a "massive strike" targeting Daesh sites in the country, after an ambush killed two US troops and a local interpreter in the Palmyra area.
The U.N. says Daesh still boasts an estimated 5,000 to 7,000 fighters in both countries.
