British Air Force Typhoon FGR4s have operated alongside French warplanes in a joint strike targeting an underground arms cache in Syrian territory operated by the IS group, as stated by the British defence ministry.
The location, identified by reconnaissance, was believed to be containing munitions and bombs, the announcement noted, and was located in mountains just north of the historic site of Palmyra in Syria's central region.
"The RAF jets utilized precision-guided Paveway IV munitions to target a number of entry passages leading to the facility... preliminary assessments suggest the target was engaged successfully," the ministry announced.
There was no sign of any civilian casualties in the attack late on Saturday and each participating jet returned safely, the MoD added.
The Typhoon fighters were supported by a Voyager aerial refuelling aircraft.
The Islamic State group - also known as ISIS - enforced jihadist rule over large swathes of both Syria and Iraq until 2019.
"This strike shows British leadership, and determination to operate in unison with our allies, to eliminate any revival of IS and their violent and radical beliefs in the Middle East," Britain's Defence Chief the Defence Secretary said.
RAF aircraft have carried out surveillance missions over Syria to "prevent any attempted resurgence" of the group after its military defeat at the climactic battle in Baghuz in 2019, the ministry said.
"I want to thank every member of our armed forces involved in this strike for their professionalism and their courage," the Defence Secretary said. "Including them were numerous British troops stationed over Christmas and New Year. This action, to eliminate dangerous terrorists who threaten our safety, highlights how British military are always on standby, throughout the year, ensuring Britain's security within its borders and powerful internationally."
Last December, the US military conducted what it called a "massive strike" targeting Islamic State objectives in Syria, subsequent to an ambush claimed the lives of two American soldiers and a civilian interpreter in the Palmyra area.
The UN says IS still boasts between 5,000 and 7,000 combatants in both countries.
