Britain and France conducted a joint strike late Saturday against an underground arms cache in Syria used by Islamic State (IS), the U.K. defense ministry said.

Royal Air Force Typhoon jets were joined by French aircraft in the strike near the city of Palmyra in central Syria, the ministry said in a statement.

“Careful intelligence analysis identified an underground facility, in the mountains some miles north of the ancient site of Palmyra,” the ministry said. The analysis led officials to believe the facility was storing arms and explosives, according to the statement.

“Our aircraft used Paveway IV guided bombs to target a number of access tunnels down to the facility,” the ministry said. The aircraft “completed successful strikes,” it said.