British Air Force Typhoon jets have conducted a mission with French warplanes in a joint strike against an underground arms cache in Syrian territory used by the IS group, per a report from the British defence ministry.
The location, pinpointed through intelligence, was thought to be housing weapons and explosive materials, the statement said, and was positioned in mountains just north of the historic site of Palmyra in the heart of Syria.
"The RAF jets used laser-guided Paveway IV weapons to target a number of entry passages leading to the facility... early reports suggest the objective was successfully hit," the MoD said.
There was no indication of any civilian impact in the attack on Saturday evening and each participating jet returned safely, the MoD added.
The Typhoon FGR4s were backed up by a Voyager refuelling tanker.
The Islamic State group - also known as ISIS - enforced jihadist rule over parts of Syria and Iraq before its territorial defeat in 2019.
"This action underscores the UK's leading role, and determination to operate in unison with allied nations, to eradicate any re-emergence of IS and their violent and radical beliefs in the area," UK Defence Secretary the Defence Secretary remarked.
UK warplanes have conducted surveillance missions over Syrian airspace to "forestall any attempted comeback" of IS following its military defeat at the Baghuz confrontation in 2019, the MoD reported.
"I extend gratitude to all the members of British forces who took part in this operation for their professionalism and their valour," he added. "They were among thousands of British troops on duty over the festive period. This action, to remove terrorist threats who endanger our safety, demonstrates how our armed forces are always on standby, all year round, protecting the UK at home and powerful internationally."
During December, the US military carried out what it termed a "major assault" targeting IS targets in the country, after an ambush resulted in the deaths of two American soldiers and a civilian linguist in the Palmyra area.
The U.N. reports Daesh still has between 5,000 and 7,000 fighters in both countries.
