British Air Force Typhoon fighter aircraft have joined forces with France's air force in a joint strike on an subterranean weapons facility in Syria operated by the IS group, according to the UK Ministry of Defence.
The site, identified by intelligence, was believed to be storing arms and explosives, the statement said, and was situated in mountainous terrain just north of the ancient city of Palmyra in central Syria.
"Our fighter planes utilized precision-guided Paveway IV munitions to hit a series of approach shafts providing entry to the depot... preliminary assessments indicate the objective was successfully hit," the MoD said.
There was no sign of any harm to civilians in the strike on Saturday evening and all the aircraft made a safe return, the ministry further stated.
The British jets were assisted by a Voyager tanker plane.
The Islamic State group - referred to as ISIS - imposed jihadist rule over large swathes of Syria and Iraq prior to its 2019 collapse.
"This action underscores our UK leadership, and resolve to stand shoulder to shoulder with allied nations, to stamp out any re-emergence of the terrorist group and their dangerous and violent ideologies in the area," UK Defence Secretary John Healey remarked.
UK warplanes have conducted patrols over Syrian airspace to "prevent any efforts to regroup" of the group following its routing at the battle of Baghuz in the year 2019, the MoD reported.
"I must thank the personnel of British forces who took part in this operation for their skill and their bravery," the Defence Secretary added. "They were part of a great many British troops on duty over the holidays. This mission, to take out terrorist threats who endanger our security, highlights how British military are prepared to act, all year round, protecting the UK within its borders and powerful internationally."
In December, the US military conducted what it termed a "major assault" targeting Islamic State objectives in the country, after an attack resulted in the deaths of two US troops and a civilian interpreter in Palmyra.
The UN says Islamic State still maintains an estimated 5,000 to 7,000 fighters in both countries.
