Royal Air Force Typhoon fighter aircraft have joined forces with French warplanes in a joint strike on an subterranean weapons facility in Syrian territory used by the IS group, according to the British defence ministry.
The site, located using surveillance, was assessed as storing arms and explosives, the statement said, and was positioned in hills just north of the historic site of Palmyra in Syria's central region.
"Our aircraft employed Paveway IV guided bombs to hit a series of entry passages leading to the site... early reports suggest the objective was successfully hit," the ministry announced.
There was no indication of any civilian casualties in the operation on Saturday evening and every plane involved returned safely, the defence officials confirmed.
The Typhoon fighters were backed up by a Voyager tanker plane.
Daesh - referred to as the so-called Islamic State - imposed extremist governance over parts of both Syria and Iraq before its territorial defeat in 2019.
"This action shows British leadership, and commitment to stand shoulder to shoulder with our allies, to eliminate any revival of IS and their dangerous and violent ideologies in the Middle East," the British Defence Secretary John Healey said.
UK warplanes have conducted overwatch operations over Syria to "deter any efforts to regroup" of Islamic State after its routing at the Baghuz confrontation in the year 2019, the authorities noted.
"I extend gratitude to all the members of our armed forces involved in this mission for their skill and their bravery," the Defence Secretary said. "Including them were numerous UK service members on duty over the holidays. This mission, to remove dangerous terrorists who endanger our safety, shows how British military are ready to step up, all year round, keeping Britain secure at home and influential overseas."
Last December, the American forces conducted what it termed a "massive strike" against Islamic State objectives in the country, subsequent to an assault claimed the lives of two US servicemembers and a civilian linguist in Palmyra.
The U.N. estimates Daesh still maintains between 5,000 and 7,000 fighters in Iraq and Syria.
