British Air Force Typhoon FGR4s have operated alongside France's air force in a coordinated attack targeting an underground arms cache in Syria operated by the Daesh militant organization, according to the UK Ministry of Defence.
The facility, pinpointed through intelligence, was assessed as storing arms and explosives, the statement said, and was located in hills just to the north of Palmyra in central Syria.
"Our aircraft used precision-guided Paveway IV munitions to hit a series of approach shafts leading to the facility... preliminary assessments indicate the objective was successfully hit," the MoD said.
There was no sign of any civilian impact in the operation on Saturday evening and each participating jet returned safely, the MoD added.
The Typhoon fighters were backed up by a Voyager refuelling tanker.
The Islamic State group - referred to as the so-called Islamic State - established extremist governance over parts of Syria and Iraq until 2019.
"This operation underscores British leadership, and resolve to stand shoulder to shoulder with our partners, to eliminate any resurgence of Daesh and their harmful and extremist ideologies in the area," Britain's Defence Chief the Defence Secretary said.
RAF aircraft have carried out overwatch operations over Syrian airspace to "forestall any efforts to regroup" of Islamic State following its routing at the battle of Baghuz in 2019, the ministry said.
"I must thank all the members of British forces who took part in this strike for their professionalism and their valour," the Defence Secretary said. "They were part of numerous UK service members deployed over Christmas and New Year. This action, to remove terrorist threats who endanger our way of life, demonstrates how British military are prepared to act, throughout the year, protecting the UK at home and powerful internationally."
In December, the US military carried out what it called a "major assault" targeting IS targets in Syria, after an attack killed two US servicemembers and a local interpreter in Palmyra.
The United Nations says Islamic State still maintains roughly 5-7 thousand fighters in Iraq and Syria.
