RAF Typhoon FGR4s have operated alongside French aircraft in a combined operation targeting an underground arms cache in Syria operated by the Islamic State group (IS), as stated by the UK's MoD.
The location, identified by reconnaissance, was assessed as containing munitions and bombs, the statement said, and was situated in mountainous terrain just to the north of the historic site of Palmyra in the heart of Syria.
"Our fighter planes used precision-guided Paveway IV munitions to hit a series of approach shafts providing entry to the site... early reports are that the target was engaged successfully," the MoD said.
There was no sign of any harm to civilians in the operation conducted Saturday night and every plane involved returned to base without incident, the defence officials confirmed.
The Typhoon fighters were backed up by a Voyager refuelling tanker.
IS - referred to as the so-called Islamic State - enforced militant control over significant areas in both Syria and Iraq prior to its 2019 collapse.
"This operation underscores British leadership, and resolve to operate in unison with allied nations, to eliminate any resurgence of the terrorist group and their harmful and extremist ideologies in the Middle East," the British Defence Secretary John Healey remarked.
RAF aircraft have carried out overwatch operations over Syria to "deter any attempted comeback" of IS after its military defeat at the battle of Baghuz in 2019, the MoD reported.
"I extend gratitude to the personnel of the UK armed forces who took part in this operation for their expertise and their bravery," Healey said. "They were part of thousands of British personnel deployed over Christmas and New Year. This action, to eliminate dangerous terrorists who threaten our security, shows how British military are always on standby, throughout the year, ensuring Britain's security at home and strong abroad."
In December, the US military executed what it termed a "massive strike" on Daesh sites in Syria, following an ambush claimed the lives of two US servicemembers and a civilian interpreter in the Palmyra area.
The UN says Islamic State still has an estimated 5,000 to 7,000 fighters in Syria and Iraq.
