RAF Typhoon fighter aircraft have joined forces with French aircraft in a joint strike on an hidden munitions depot in Syrian territory used by the IS group, as stated by the UK's MoD.
The facility, pinpointed through reconnaissance, was assessed as housing weapons and explosive materials, the release indicated, and was located in mountainous terrain just to the north of Palmyra in the heart of Syria.
"Our fighter planes employed precision-guided Paveway IV munitions to target a several entry passages down to the facility... preliminary assessments are that the target was engaged successfully," the MoD said.
There was no indication of any civilian casualties in the operation late on Saturday and all the aircraft returned to base without incident, the MoD added.
The British jets were backed up by a Voyager refuelling tanker.
The Islamic State group - alternatively referred to as Daesh - imposed extremist governance over significant areas in Syria and Iraq before its territorial defeat in 2019.
"This strike demonstrates our UK leadership, and commitment to operate in unison with our allies, to eliminate any re-emergence of the terrorist group and their harmful and extremist ideologies in the Middle East," the British Defence Secretary the minister stated.
UK warplanes have conducted patrols over Syria to "forestall any efforts to regroup" of the group after its routing at the battle of Baghuz in 2019, the ministry said.
"I extend gratitude to every member of British forces involved in this mission for their expertise and their courage," he commented. "They were among numerous British personnel on duty over the festive period. This operation, to take out militants who endanger our security, shows how British military are ready to step up, continuously, protecting the UK within its borders and powerful internationally."
Last December, the US military conducted what it called a "large-scale strike" against Daesh sites in Syria, subsequent to an ambush killed two US servicemembers and a civilian linguist in Palmyra.
The United Nations reports Islamic State still has between 5,000 and 7,000 militants in Syria and Iraq.
