RAF Typhoon fighter aircraft have conducted a mission with France's air force in a combined operation on an underground arms cache in Syria operated by the IS group, according to the UK Ministry of Defence.
The facility, identified by intelligence, was thought to be containing munitions and bombs, the statement said, and was situated in hills just above Palmyra in Syria's central region.
"Our aircraft utilized precision-guided Paveway IV munitions to hit a several entry passages down to the site... preliminary assessments suggest the target was engaged successfully," officials stated.
There was no sign of any civilian casualties in the strike conducted Saturday night and every plane involved returned safely, the MoD added.
The Typhoon FGR4s were supported by a Voyager tanker plane.
Daesh - alternatively referred to as the so-called Islamic State - imposed militant control over significant areas in Syria and Iraq prior to its 2019 collapse.
"This action underscores our UK leadership, and resolve to work closely with our allies, to stamp out any revival of Daesh and their violent and radical beliefs in the region," UK Defence Secretary John Healey stated.
UK warplanes have conducted patrols over Syrian airspace to "forestall any efforts to regroup" of the group subsequent to its military defeat at the climactic battle in Baghuz in 2019, the ministry said.
"I want to thank the personnel of the UK armed forces involved in this strike for their skill and their valour," the Defence Secretary said. "They were part of numerous UK service members deployed over the holidays. This mission, to remove dangerous terrorists who threaten our security, demonstrates how British military are ready to step up, continuously, keeping Britain secure domestically and strong abroad."
Last December, the US military carried out what it described as a "massive strike" targeting Daesh sites in the country, subsequent to an assault killed two American soldiers and a civilian interpreter in Palmyra.
The UN estimates Daesh still has roughly 5-7 thousand fighters in Syria and Iraq.
