Royal Air Force Typhoon jets have conducted a mission with France's air force in a coordinated attack against an underground arms cache in Syrian territory employed by the IS group, as stated by the UK Ministry of Defence.
The location, pinpointed through intelligence, was assessed as housing weapons and explosive materials, the announcement noted, and was situated in mountainous terrain just to the north of the ancient city of Palmyra in the heart of Syria.
"Our aircraft utilized precision-guided Paveway IV munitions to target a number of access tunnels providing entry to the depot... initial indications suggest the strike was effective," the MoD said.
There was no sign of any civilian impact in the attack late on Saturday and each participating jet returned to base without incident, the MoD added.
The Typhoon FGR4s were backed up by a Voyager aerial refuelling aircraft.
The Islamic State group - also known as Daesh - established jihadist rule over significant areas in both Syria and Iraq until 2019.
"This strike demonstrates British leadership, and commitment to operate in unison with allied nations, to eliminate any revival of IS and their harmful and extremist ideologies in the area," UK Defence Secretary John Healey stated.
RAF aircraft have carried out overwatch operations over Syrian airspace to "prevent any attempted comeback" of Islamic State following its military defeat at the Baghuz confrontation in 2019, the authorities noted.
"I want to thank all the members of our armed forces who took part in this strike for their skill and their courage," Healey commented. "Including them were numerous British personnel on duty over Christmas and New Year. This action, to eliminate dangerous terrorists who endanger our security, highlights how UK forces are ready to step up, throughout the year, protecting the UK within its borders and influential overseas."
Last December, the US military executed what it described as a "major assault" on IS targets in the country, after an ambush claimed the lives of two US servicemembers and a local interpreter in the Palmyra area.
The United Nations reports IS still boasts roughly 5-7 thousand militants in Syria and Iraq.
