RAF Typhoon jets have conducted a mission with French warplanes in a joint strike against an underground arms cache in Syrian territory employed by the IS group, according to the UK's MoD.
The location, identified by reconnaissance, was assessed as containing munitions and bombs, the statement said, and was positioned in mountainous terrain just above the ancient city of Palmyra in Syria's central region.
"Our fighter planes utilized Paveway IV guided bombs to hit a several access tunnels leading to the site... preliminary assessments indicate the objective was successfully hit," officials stated.
There was no sign of any civilian casualties in the attack late on Saturday and each participating jet made a safe return, the ministry further stated.
The Typhoon fighters were assisted by a Voyager refuelling tanker.
The Islamic State group - alternatively referred to as the so-called Islamic State - established militant control over significant areas in Iraq and Syria until 2019.
"This action demonstrates the UK's leading role, and resolve to operate in unison with allied nations, to stamp out any revival of IS and their harmful and extremist ideologies in the Middle East," UK Defence Secretary the Defence Secretary remarked.
UK warplanes have conducted overwatch operations over Syria to "prevent any efforts to regroup" of Islamic State following its routing at the Baghuz confrontation in 2019, the authorities noted.
"I must thank every member of our armed forces involved in this strike for their skill and their valour," the Defence Secretary said. "Including them were numerous British troops on duty over the holidays. This mission, to remove dangerous terrorists who pose a risk to our safety, highlights how British military are ready to step up, continuously, keeping Britain secure at home and strong abroad."
In December, the US military carried out what it described as a "massive strike" against IS targets in Syria, following an ambush resulted in the deaths of two US troops and a civilian linguist in Palmyra.
The United Nations says IS still boasts roughly 5-7 thousand combatants in both countries.
