RAF Typhoon jets have conducted a mission with France's air force in a joint strike on an underground arms cache in Syrian territory operated by the IS group, according to the UK's MoD.
The location, pinpointed through surveillance, was assessed as containing munitions and bombs, the release indicated, and was situated in mountains just north of the ancient city of Palmyra in Syria's central region.
"Our aircraft utilized precision-guided Paveway IV munitions to target a several access tunnels leading to the site... initial indications are that the strike was effective," officials stated.
There was no sign of any civilian impact in the strike conducted Saturday night and each participating jet made a safe return, the MoD added.
The Typhoon fighters were supported by a Voyager refuelling tanker.
IS - also known as ISIS - enforced jihadist rule over parts of Iraq and Syria before its territorial defeat in 2019.
"This strike underscores British leadership, and commitment to work closely with our allies, to eradicate any revival of the terrorist group and their harmful and extremist ideologies in the area," the British Defence Secretary the minister stated.
British military aircraft have conducted surveillance missions over Syria to "deter any efforts to regroup" of Islamic State after its defeat at the climactic battle in Baghuz in the year 2019, the MoD reported.
"I want to thank every member of our armed forces participating in this strike for their professionalism and their courage," the Defence Secretary commented. "They were among numerous British personnel stationed over the holidays. This mission, to take out dangerous terrorists who endanger our security, shows how UK forces are always on standby, throughout the year, keeping Britain secure at home and powerful internationally."
Last December, the American forces executed what it termed a "major assault" against IS targets in the country, following an assault killed two US servicemembers and a civilian linguist in the Palmyra area.
The U.N. estimates Daesh still maintains between 5,000 and 7,000 fighters in Iraq and Syria.
