RAF Typhoon fighter aircraft have operated alongside French warplanes in a combined operation on an hidden munitions depot in Syrian territory operated by the IS group, according to the UK's MoD.
The facility, identified by reconnaissance, was assessed as storing arms and explosives, the announcement noted, and was positioned in mountains just above the ancient city of Palmyra in central Syria.
"Our fighter planes used precision-guided Paveway IV munitions to strike a series of access tunnels providing entry to the facility... preliminary assessments suggest the strike was effective," the MoD said.
There was no evidence of any civilian casualties in the strike late on Saturday and all the aircraft returned to base without incident, the ministry further stated.
The Typhoon FGR4s were backed up by a Voyager refuelling tanker.
IS - referred to as ISIS - established militant control over significant areas in Syria and Iraq prior to its 2019 collapse.
"This strike underscores British leadership, and determination to operate in unison with our partners, to eradicate any re-emergence of IS and their dangerous and violent ideologies in the Middle East," UK Defence Secretary John Healey remarked.
UK warplanes have conducted overwatch operations over Syria to "deter any attempted resurgence" of IS following its military defeat at the Baghuz confrontation in 2019, the ministry said.
"I want to thank every member of British forces participating in this mission for their skill and their bravery," he said. "Including them were numerous UK service members deployed over the holidays. This action, to eliminate terrorist threats who threaten our security, demonstrates how our armed forces are prepared to act, continuously, ensuring Britain's security within its borders and influential overseas."
During December, the American forces conducted what it termed a "large-scale strike" on Daesh sites in the country, following an assault resulted in the deaths of two American soldiers and a local interpreter in Palmyra.
The UN reports Daesh still boasts between 5,000 and 7,000 fighters in Iraq and Syria.
