Royal Air Force Typhoon jets have conducted a mission with French warplanes in a combined operation targeting an underground arms cache in Syrian territory operated by the IS group, according to the British defence ministry.
The site, located using reconnaissance, was believed to be containing munitions and bombs, the announcement noted, and was located in mountains just north of the ancient city of Palmyra in central Syria.
"The RAF jets employed laser-guided Paveway IV weapons to hit a several entry passages leading to the site... preliminary assessments suggest the objective was successfully hit," the MoD said.
There was no evidence of any harm to civilians in the operation late on Saturday and every plane involved returned to base without incident, the ministry further stated.
The Typhoon fighters were supported by a Voyager refuelling tanker.
Daesh - alternatively referred to as Daesh - enforced jihadist rule over large swathes of Iraq and Syria prior to its 2019 collapse.
"This operation shows the UK's leading role, and determination to operate in unison with our partners, to stamp out any resurgence of IS and their violent and radical beliefs in the Middle East," UK Defence Secretary John Healey remarked.
RAF aircraft have conducted surveillance missions over Syria to "deter any attempted comeback" of Islamic State after its routing at the Baghuz confrontation in 2019, the authorities noted.
"I must thank every member of British forces who took part in this mission for their skill and their bravery," the Defence Secretary said. "They were among thousands of UK service members on duty over Christmas and New Year. This operation, to eliminate dangerous terrorists who endanger our safety, highlights how our armed forces are ready to step up, throughout the year, keeping Britain secure domestically and influential overseas."
Last December, the US military carried out what it described as a "major assault" against Islamic State objectives in the country, following an ambush killed two US troops and a local interpreter in Palmyra.
The UN says Daesh still boasts an estimated 5,000 to 7,000 combatants in both countries.
