RAF Typhoon jets have operated alongside France's air force in a coordinated attack on an subterranean weapons facility in Syria used by the Daesh militant organization, according to the British defence ministry.
The site, pinpointed through intelligence, was assessed as containing munitions and bombs, the statement said, and was situated in hills just to the north of Palmyra in central Syria.
"The RAF jets employed precision-guided Paveway IV munitions to target a number of entry passages providing entry to the site... early reports indicate the objective was successfully hit," the MoD said.
There was no sign of any civilian casualties in the operation late on Saturday and all the aircraft made a safe return, the ministry further stated.
The Typhoon FGR4s were supported by a Voyager refuelling tanker.
IS - referred to as ISIS - established extremist governance over large swathes of Syria and Iraq prior to its 2019 collapse.
"This action demonstrates our UK leadership, and determination to operate in unison with allied nations, to eliminate any re-emergence of the terrorist group and their dangerous and violent ideologies in the region," Britain's Defence Chief John Healey said.
RAF aircraft have conducted overwatch operations over Syria to "prevent any attempted comeback" of IS subsequent to its military defeat at the Baghuz confrontation in 2019, the authorities noted.
"I want to thank every member of our armed forces involved in this mission for their professionalism and their valour," he said. "They were part of numerous British troops deployed over the holidays. This operation, to remove militants who endanger our security, highlights how British military are prepared to act, all year round, ensuring Britain's security at home and influential overseas."
In December, the United States armed forces executed what it termed a "large-scale strike" on Islamic State objectives in the country, subsequent to an assault killed two American soldiers and a local interpreter in Palmyra.
The U.N. says IS still has between 5,000 and 7,000 combatants in both countries.
