British Air Force Typhoon fighter aircraft have operated alongside French aircraft in a coordinated attack on an subterranean weapons facility in Syria operated by the IS group, according to the UK Ministry of Defence.
The site, identified by reconnaissance, was assessed as containing munitions and bombs, the release indicated, and was positioned in mountains just north of the historic site of Palmyra in Syria's central region.
"The RAF jets utilized Paveway IV guided bombs to strike a several approach shafts down to the depot... preliminary assessments indicate the objective was successfully hit," the MoD said.
There was no indication of any civilian impact in the operation late on Saturday and all the aircraft returned safely, the defence officials confirmed.
The British jets were supported by a Voyager refuelling tanker.
Daesh - alternatively referred to as the so-called Islamic State - established extremist governance over significant areas in both Syria and Iraq prior to its 2019 collapse.
"This strike shows British leadership, and commitment to stand shoulder to shoulder with our allies, to eliminate any re-emergence of Daesh and their harmful and extremist ideologies in the area," the British Defence Secretary the Defence Secretary stated.
UK warplanes have conducted surveillance missions over Syria to "prevent any attempted resurgence" of the group after its defeat at the battle of Baghuz in 2019, the ministry said.
"I extend gratitude to all the members of the UK armed forces involved in this mission for their skill and their courage," he said. "They were part of a great many British personnel deployed over the festive period. This mission, to eliminate militants who endanger our safety, highlights how British military are always on standby, continuously, keeping Britain secure at home and powerful internationally."
During December, the US military conducted what it termed a "large-scale strike" against IS targets in Syria, following an ambush claimed the lives of two American soldiers and a civilian interpreter in Palmyra.
The United Nations reports Islamic State still has between 5,000 and 7,000 fighters in both countries.
