RAF Typhoon FGR4s have joined forces with France's air force in a coordinated attack targeting an subterranean weapons facility in Syrian territory employed by the Islamic State group (IS), according to the UK's MoD.
The site, located using surveillance, was assessed as storing arms and explosives, the announcement noted, and was positioned in hills just to the north of Palmyra in the heart of Syria.
"Our fighter planes utilized laser-guided Paveway IV weapons to target a series of entry passages providing entry to the facility... early reports indicate the objective was successfully hit," the ministry announced.
There was no sign of any civilian casualties in the operation late on Saturday and all the aircraft made a safe return, the defence officials confirmed.
The Typhoon fighters were supported by a Voyager aerial refuelling aircraft.
IS - alternatively referred to as ISIS - enforced extremist governance over large swathes of both Syria and Iraq until 2019.
"This strike shows British leadership, and determination to stand shoulder to shoulder with our allies, to stamp out any revival of the terrorist group and their harmful and extremist ideologies in the area," UK Defence Secretary the minister said.
UK warplanes have performed surveillance missions over Syria to "forestall any attempted resurgence" of Islamic State following its military defeat at the Baghuz confrontation in 2019, the ministry said.
"I must thank every member of British forces participating in this mission for their expertise and their valour," he commented. "They were among a great many British troops on duty over the festive period. This operation, to remove militants who threaten our safety, shows how British military are prepared to act, all year round, ensuring Britain's security within its borders and influential overseas."
In December, the US military executed what it described as a "massive strike" targeting Islamic State objectives in the country, following an ambush killed two American soldiers and a local interpreter in Palmyra.
The UN says IS still maintains between 5,000 and 7,000 fighters in both countries.
