RAF Typhoon fighter aircraft have conducted a mission with French warplanes in a coordinated attack on an underground arms cache in Syrian territory employed by the IS group, per a report from the UK's MoD.
The site, identified by reconnaissance, was believed to be housing weapons and explosive materials, the statement said, and was situated in mountains just above Palmyra in central Syria.
"Our aircraft employed Paveway IV guided bombs to hit a several entry passages providing entry to the depot... preliminary assessments are that the strike was effective," the MoD said.
There was no indication of any harm to civilians in the strike late on Saturday and each participating jet returned safely, the defence officials confirmed.
The British jets were assisted by a Voyager tanker plane.
Daesh - referred to as ISIS - established extremist governance over large swathes of Iraq and Syria prior to its 2019 collapse.
"This action underscores British leadership, and determination to operate in unison with our partners, to eliminate any revival of the terrorist group and their violent and radical beliefs in the region," the British Defence Secretary John Healey remarked.
RAF aircraft have carried out overwatch operations over Syria to "deter any attempted comeback" of IS following its routing at the battle of Baghuz in 2019, the MoD reported.
"I want to thank the personnel of our armed forces involved in this mission for their skill and their bravery," he commented. "They were among a great many British personnel stationed over the holidays. This action, to take out militants who pose a risk to our security, shows how British military are always on standby, all year round, ensuring Britain's security within its borders and powerful internationally."
During December, the United States armed forces conducted what it termed a "massive strike" on IS targets in Syria, following an attack claimed the lives of two US troops and a civilian linguist in Palmyra.
The U.N. says Daesh still has an estimated 5,000 to 7,000 militants in both countries.
