British Air Force Typhoon FGR4s have conducted a mission with France's air force in a joint strike on an underground arms cache in Syria employed by the Daesh militant organization, according to the UK Ministry of Defence.
The site, identified by intelligence, was assessed as containing munitions and bombs, the statement said, and was situated in hills just north of the historic site of Palmyra in central Syria.
"Our fighter planes utilized Paveway IV guided bombs to hit a series of entry passages leading to the site... initial indications indicate the strike was effective," the ministry announced.
There was no sign of any civilian impact in the attack conducted Saturday night and each participating jet returned safely, the defence officials confirmed.
The British jets were assisted by a Voyager tanker plane.
IS - also known as ISIS - imposed jihadist rule over large swathes of both Syria and Iraq prior to its 2019 collapse.
"This strike demonstrates the UK's leading role, and commitment to work closely with our allies, to stamp out any re-emergence of the terrorist group and their dangerous and violent ideologies in the region," UK Defence Secretary the Defence Secretary remarked.
RAF aircraft have performed patrols over Syria to "deter any attempted comeback" of IS after its military defeat at the Baghuz confrontation in 2019, the ministry said.
"I must thank the personnel of the UK armed forces participating in this strike for their expertise and their valour," the Defence Secretary added. "Including them were numerous British troops on duty over Christmas and New Year. This operation, to take out dangerous terrorists who endanger our safety, highlights how British military are always on standby, all year round, keeping Britain secure at home and strong abroad."
In December, the American forces executed what it called a "large-scale strike" on IS targets in Syria, following an assault resulted in the deaths of two American soldiers and a civilian linguist in Palmyra.
The U.N. reports Islamic State still maintains an estimated 5,000 to 7,000 combatants in both countries.
