British and French warplanes conducted a joint airstrike on a suspected underground Islamic State (IS) arms facility in Syria on Saturday evening. The target, located in mountains north of Palmyra, was believed to be used for storing weapons and explosives. The UK Ministry of Defence stated that intelligence identified the site, and the operation used Paveway IV guided bombs to target access tunnels. Both ministries confirmed the strike was successful, with no civilian harm reported and all aircraft returning safely. This action is framed as a demonstration of allied determination to counter IS resurgence.