Royal Air Force Typhoon jets have operated alongside French aircraft in a coordinated attack on an subterranean weapons facility in Syrian territory operated by the Islamic State group (IS), according to the UK Ministry of Defence.
The location, located using intelligence, was thought to be containing munitions and bombs, the release indicated, and was positioned in hills just to the north of the historic site of Palmyra in central Syria.
"Our aircraft used Paveway IV guided bombs to hit a several entry passages down to the site... preliminary assessments are that the strike was effective," the MoD said.
There was no sign of any harm to civilians in the attack on Saturday evening and all the aircraft made a safe return, the ministry further stated.
The Typhoon FGR4s were supported by a Voyager refuelling tanker.
Daesh - referred to as the so-called Islamic State - imposed extremist governance over significant areas in Syria and Iraq until 2019.
"This action underscores the UK's leading role, and resolve to work closely with our partners, to stamp out any resurgence of the terrorist group and their harmful and extremist ideologies in the Middle East," the British Defence Secretary the minister said.
UK warplanes have performed surveillance missions over Syria to "forestall any efforts to regroup" of Islamic State following its routing at the battle of Baghuz in 2019, the ministry said.
"I extend gratitude to all the members of our armed forces involved in this strike for their expertise and their courage," he said. "Including them were a great many UK service members deployed over the holidays. This operation, to take out terrorist threats who endanger our way of life, shows how British military are always on standby, all year round, keeping Britain secure domestically and influential overseas."
During December, the United States armed forces carried out what it termed a "major assault" on Islamic State objectives in Syria, after an assault claimed the lives of two US troops and a local interpreter in Palmyra.
The United Nations estimates IS still has between 5,000 and 7,000 fighters in Iraq and Syria.
