RAF Typhoon fighter aircraft have conducted a mission with French aircraft in a combined operation against an subterranean weapons facility in Syrian territory used by the Islamic State group (IS), per a report from the UK's MoD.
The location, located using surveillance, was assessed as storing arms and explosives, the statement said, and was positioned in mountains just above the ancient city of Palmyra in the heart of Syria.
"The RAF jets used precision-guided Paveway IV munitions to hit a several access tunnels providing entry to the facility... preliminary assessments indicate the strike was effective," the ministry announced.
There was no indication of any harm to civilians in the operation conducted Saturday night and each participating jet made a safe return, the defence officials confirmed.
The British jets were supported by a Voyager aerial refuelling aircraft.
IS - referred to as the so-called Islamic State - enforced militant control over significant areas in both Syria and Iraq prior to its 2019 collapse.
"This operation underscores the UK's leading role, and resolve to stand shoulder to shoulder with allied nations, to stamp out any re-emergence of IS and their harmful and extremist ideologies in the area," Britain's Defence Chief the minister said.
UK warplanes have conducted patrols over Syrian airspace to "deter any attempted comeback" of the group after its routing at the climactic battle in Baghuz in 2019, the ministry said.
"I want to thank all the members of the UK armed forces who took part in this operation for their skill and their bravery," he said. "They were among thousands of UK service members on duty over the festive period. This mission, to eliminate militants who endanger our security, demonstrates how British military are prepared to act, throughout the year, protecting the UK within its borders and powerful internationally."
Last December, the American forces carried out what it termed a "massive strike" targeting Islamic State objectives in the country, subsequent to an ambush killed two American soldiers and a civilian linguist in Palmyra.
The UN says IS still has between 5,000 and 7,000 militants in both countries.
