RAF Typhoon fighter aircraft have conducted a mission with French warplanes in a joint strike on an subterranean weapons facility in Syrian territory operated by the Daesh militant organization, according to the British defence ministry.
The site, located using surveillance, was believed to be housing weapons and explosive materials, the statement said, and was positioned in mountains just above the historic site of Palmyra in Syria's central region.
"The RAF jets used precision-guided Paveway IV munitions to target a number of access tunnels leading to the facility... early reports indicate the target was engaged successfully," the ministry announced.
There was no indication of any civilian casualties in the attack late on Saturday and all the aircraft returned to base without incident, the MoD added.
The Typhoon FGR4s were supported by a Voyager aerial refuelling aircraft.
Daesh - also known as ISIS - established jihadist rule over large swathes of Iraq and Syria prior to its 2019 collapse.
"This operation underscores the UK's leading role, and resolve to operate in unison with our allies, to stamp out any resurgence of IS and their violent and radical beliefs in the Middle East," UK Defence Secretary John Healey said.
British military aircraft have performed overwatch operations over Syria to "forestall any attempted comeback" of IS following its routing at the climactic battle in Baghuz in 2019, the ministry said.
"I extend gratitude to all the members of British forces involved in this mission for their expertise and their valour," Healey said. "They were among thousands of British personnel stationed over Christmas and New Year. This action, to eliminate terrorist threats who pose a risk to our security, highlights how UK forces are ready to step up, continuously, ensuring Britain's security domestically and influential overseas."
During December, the United States armed forces carried out what it described as a "large-scale strike" targeting Islamic State objectives in the country, following an assault resulted in the deaths of two US troops and a civilian linguist in Palmyra.
The United Nations says Daesh still boasts an estimated 5,000 to 7,000 fighters in Syria and Iraq.
