[Translated from French]
Five drones were technically detected Thursday evening around 7:30 p.m. [Thursday Dec 4, 2025] over the naval base, which borders the Brest harbor, the gendarmerie announced. A counter-drone and search operation was launched. The marine rifle battalion, which is responsible for protecting the base, carried out several anti-drone strikes, according to the same source.

On Friday evening, the Rennes prosecutor's office informed AFP that no drones had been shot down and that no pilots had been identified. "Therefore, no link to foreign interference has been established ," added Public Prosecutor Frédéric Teillet, specifying that the marines had "used a jammer, not a firearm," against the drones.

The investigation opened by the Rennes public prosecutor's office, which has jurisdiction over military matters, "must, in particular, identify and interview the individuals who made the reports in order to confirm or deny that they are indeed drones" and determine "the type and number of devices ," the prosecutor explained. "It is too early to characterize" the origin of the drones, Mr. Le Rasle added. He did, however, believe that these flights over the submarine base on Île Longue were "intended to alarm the public . "