Royal Air Force Typhoon fighter aircraft have operated alongside French warplanes in a coordinated attack on an underground arms cache in Syria used by the IS group, as stated by the British defence ministry.
The site, pinpointed through reconnaissance, was assessed as storing arms and explosives, the statement said, and was located in mountainous terrain just to the north of the ancient city of Palmyra in the heart of Syria.
"Our aircraft employed Paveway IV guided bombs to hit a several entry passages down to the site... initial indications indicate the target was engaged successfully," the ministry announced.
There was no evidence of any civilian casualties in the operation late on Saturday and all the aircraft made a safe return, the ministry further stated.
The British jets were assisted by a Voyager refuelling tanker.
Daesh - referred to as ISIS - imposed jihadist rule over parts of Iraq and Syria until 2019.
"This action underscores British leadership, and resolve to operate in unison with our partners, to stamp out any revival of Daesh and their dangerous and violent ideologies in the area," Britain's Defence Chief John Healey remarked.
British military aircraft have carried out surveillance missions over Syrian airspace to "prevent any attempted resurgence" of the group following its routing at the Baghuz confrontation in 2019, the ministry said.
"I extend gratitude to the personnel of our armed forces who took part in this strike for their professionalism and their valour," he said. "They were part of thousands of UK service members on duty over the festive period. This mission, to eliminate dangerous terrorists who threaten our security, shows how our armed forces are prepared to act, continuously, keeping Britain secure within its borders and strong abroad."
During December, the United States armed forces carried out what it described as a "major assault" against Daesh sites in the country, subsequent to an ambush claimed the lives of two American soldiers and a civilian interpreter in the Palmyra area.
The UN says Islamic State still boasts an estimated 5,000 to 7,000 militants in both countries.
