RAF Typhoon FGR4s have joined forces with French warplanes in a combined operation on an underground arms cache in Syria used by the IS group, per a report from the UK Ministry of Defence.
The location, identified by intelligence, was assessed as containing munitions and bombs, the announcement noted, and was located in mountainous terrain just north of the historic site of Palmyra in Syria's central region.
"The RAF jets used precision-guided Paveway IV munitions to hit a series of approach shafts down to the facility... initial indications suggest the objective was successfully hit," the MoD said.
There was no sign of any civilian impact in the operation late on Saturday and every plane involved returned safely, the ministry further stated.
The Typhoon fighters were assisted by a Voyager refuelling tanker.
IS - also known as the so-called Islamic State - established militant control over significant areas in Iraq and Syria until 2019.
"This action shows the UK's leading role, and resolve to operate in unison with our allies, to eliminate any resurgence of Daesh and their dangerous and violent ideologies in the Middle East," Britain's Defence Chief John Healey remarked.
British military aircraft have conducted overwatch operations over Syria to "prevent any attempted comeback" of IS following its defeat at the climactic battle in Baghuz in 2019, the MoD reported.
"I extend gratitude to the personnel of our armed forces who took part in this mission for their expertise and their bravery," the Defence Secretary added. "They were among numerous British personnel stationed over the holidays. This action, to take out dangerous terrorists who threaten our security, shows how our armed forces are ready to step up, continuously, keeping Britain secure at home and powerful internationally."
Last December, the American forces executed what it described as a "major assault" on Daesh sites in the country, after an ambush killed two US servicemembers and a local interpreter in Palmyra.
The United Nations estimates Daesh still has roughly 5-7 thousand fighters in Syria and Iraq.
