RAF Typhoon fighter aircraft have operated alongside France's air force in a joint strike on an subterranean weapons facility in Syria operated by the Islamic State group (IS), as stated by the UK's MoD.
The site, identified by intelligence, was assessed as containing munitions and bombs, the statement said, and was located in mountains just north of the ancient city of Palmyra in central Syria.
"The RAF jets employed laser-guided Paveway IV weapons to strike a number of approach shafts providing entry to the site... preliminary assessments indicate the strike was effective," the ministry announced.
There was no sign of any civilian casualties in the attack conducted Saturday night and each participating jet returned safely, the ministry further stated.
The British jets were assisted by a Voyager tanker plane.
Daesh - also known as the so-called Islamic State - enforced jihadist rule over significant areas in Syria and Iraq prior to its 2019 collapse.
"This operation underscores British leadership, and resolve to work closely with our partners, to eliminate any revival of Daesh and their harmful and extremist ideologies in the Middle East," UK Defence Secretary the minister remarked.
RAF aircraft have conducted overwatch operations over Syria to "deter any attempted resurgence" of Islamic State following its routing at the climactic battle in Baghuz in the year 2019, the MoD reported.
"I extend gratitude to all the members of our armed forces who took part in this mission for their skill and their courage," he said. "They were part of thousands of UK service members deployed over Christmas and New Year. This mission, to eliminate terrorist threats who endanger our safety, highlights how UK forces are always on standby, throughout the year, protecting the UK domestically and powerful internationally."
Last December, the US military carried out what it termed a "massive strike" on Daesh sites in Syria, following an assault killed two US servicemembers and a local interpreter in Palmyra.
The UN estimates IS still has an estimated 5,000 to 7,000 militants in Syria and Iraq.
