British and French jets jointly attacked an Islamic State underground base in Syria on Saturday evening, the UK Ministry of Defence said. Guided bombs targeted access tunnels to the site in the mountainous area near Syria's ancient city of Palmyra. "Initial indications are that the target was engaged successfully," the ministry said. Typhoon FGR4 combat jets carried out the bombing, supported by a Voyager refuelling tanker. The site was likely used to store weapons and explosives. The ministry added that the surrounding area had no civilians. Defence Secretary John Healey said the UK stays determined to "stand shoulder to shoulder with our allies" to "stamp out any resurgence" of Islamic State. He thanked the armed forces for their role in eliminating "dangerous terrorists who threaten our way of life." Western aircraft regularly patrol the region to stop any return of the militant group, which controlled parts of Syria until 2019.