British and French warplanes struck an underground facility believed to have been used by Islamic State militants to store weapons and explosives, the U.K. Ministry of Defence confirmed Sunday.
The strike took place Saturday evening in a mountainous region north of Palmyra, in Syria’s Homs province.
In a statement, the Ministry of Defence said Royal Air Force Typhoon FGR4 fighter jets, supported by a Voyager refueling tanker, operated with French aircraft to strike access tunnels leading to the underground site.
An assessment was ongoing, but initial indications suggested that the target was successfully hit, the ministry said.