Royal Air Force Typhoon fighter aircraft have operated alongside French warplanes in a combined operation on an subterranean weapons facility in Syrian territory used by the IS group, as stated by the British defence ministry.
The site, located using intelligence, was believed to be containing munitions and bombs, the statement said, and was positioned in hills just to the north of Palmyra in central Syria.
"Our fighter planes utilized precision-guided Paveway IV munitions to strike a number of access tunnels down to the depot... initial indications are that the objective was successfully hit," the ministry announced.
There was no indication of any civilian impact in the strike conducted Saturday night and every plane involved returned safely, the defence officials confirmed.
The British jets were assisted by a Voyager tanker plane.
The Islamic State group - referred to as Daesh - enforced militant control over large swathes of Iraq and Syria before its territorial defeat in 2019.
"This action underscores British leadership, and resolve to operate in unison with our allies, to eradicate any revival of the terrorist group and their dangerous and violent ideologies in the Middle East," UK Defence Secretary John Healey said.
British military aircraft have performed patrols over Syrian airspace to "deter any attempted resurgence" of the group after its defeat at the battle of Baghuz in 2019, the ministry said.
"I must thank every member of the UK armed forces who took part in this strike for their professionalism and their valour," the Defence Secretary added. "They were part of numerous UK service members deployed over the holidays. This mission, to eliminate dangerous terrorists who threaten our security, highlights 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 called a "large-scale strike" on Islamic State objectives in the country, following an assault killed two US troops and a civilian linguist in the Palmyra area.
The U.N. estimates IS still maintains between 5,000 and 7,000 militants in Syria and Iraq.
