RAF Typhoon fighter aircraft have joined forces with French aircraft in a combined operation against an underground arms cache in Syria employed by the IS group, per a report from the UK Ministry of Defence.
The site, identified by surveillance, was thought to be storing arms and explosives, the statement said, and was located in mountainous terrain just north of the ancient city of Palmyra in the heart of Syria.
"Our fighter planes utilized Paveway IV guided bombs to hit a number of entry passages leading to the facility... initial indications are that the strike was effective," the MoD said.
There was no evidence of any civilian impact in the operation late on Saturday and all the aircraft returned to base without incident, the MoD added.
The Typhoon fighters were assisted by a Voyager aerial refuelling aircraft.
IS - also known as ISIS - enforced extremist governance over significant areas in Syria and Iraq prior to its 2019 collapse.
"This action demonstrates British leadership, and commitment to operate in unison with our partners, to eradicate any re-emergence of IS and their dangerous and violent ideologies in the Middle East," Britain's Defence Chief John Healey remarked.
RAF aircraft have carried out patrols over Syria to "deter any attempted comeback" of Islamic State following its defeat at the battle of Baghuz in the year 2019, the ministry said.
"I extend gratitude to all the members of the UK armed forces participating in this mission for their professionalism and their courage," Healey added. "They were among a great many UK service members stationed over the holidays. This operation, to take out terrorist threats who pose a risk to our safety, shows how British military are prepared to act, all year round, ensuring Britain's security domestically and powerful internationally."
During December, the American forces executed what it termed a "major assault" against Islamic State objectives in Syria, subsequent to an attack killed two US troops and a civilian linguist in Palmyra.
The UN reports Islamic State still maintains an estimated 5,000 to 7,000 militants in both countries.