British Air Force Typhoon FGR4s have joined forces with French warplanes in a coordinated attack against an underground arms cache in Syria used by the IS group, per a report from the UK's MoD.
The site, located using intelligence, was believed to be storing arms and explosives, the statement said, and was situated in mountains just to the north of the historic site of Palmyra in Syria's central region.
"The RAF jets used precision-guided Paveway IV munitions to hit a several entry passages leading to the facility... preliminary assessments are that the objective was successfully hit," officials stated.
There was no evidence of any civilian impact in the strike late on Saturday and every plane involved made a safe return, the MoD added.
The Typhoon FGR4s were backed up by a Voyager refuelling tanker.
IS - referred to as ISIS - established jihadist rule over significant areas in Syria and Iraq prior to its 2019 collapse.
"This action shows our UK leadership, and resolve to operate in unison with allied nations, to eliminate any resurgence of Daesh and their dangerous and violent ideologies in the Middle East," the British Defence Secretary the Defence Secretary remarked.
RAF aircraft have conducted surveillance missions over Syrian airspace to "forestall any attempted comeback" of IS after its military defeat at the battle of Baghuz in 2019, the authorities noted.
"I want to thank every member of our armed forces involved in this mission for their skill and their valour," the Defence Secretary added. "They were among a great many UK service members on duty over Christmas and New Year. This action, to eliminate dangerous terrorists who pose a risk to our safety, shows how our armed forces are ready to step up, continuously, keeping Britain secure domestically and powerful internationally."
Last December, the United States armed forces carried out what it termed a "major assault" targeting IS targets in Syria, after an assault killed two American soldiers and a civilian linguist in Palmyra.
The United Nations says IS still maintains between 5,000 and 7,000 combatants in Iraq and Syria.
