The Jassbach military barracks in the canton of Bern has been overflown at night by drones in what looks like an espionage attempt.
Cyber and intelligence specialists work at the site, which was targeted in February.
The drones are thought to be foreign.
The International Institute for Strategic Studies has counted 144 suspicious drone incidents across Europe, and Switzerland does not yet have effective means to counter this kind of threat.
Swiss Post announce job cuts
Swiss Post will eliminate up to 110 positions in 2027, blaming shrinking letter volumes and fewer over-the-counter transactions
Autumn arrives in Switzerland
The heatwave that has gripped Switzerland since May finally breaks tomorrow
Driver warning in Vaud
Drivers in western Vaud face four nights of disruption on the A1 next week.
Mixed results in school classrooms
Swiss 15-year-olds still rank among the world's best in maths and science, but their performance in reading and maths is sliding
Good news for household bills
Swiss households will pay a little less for electricity next year
Fuel reserves now in use
Switzerland is dipping into its emergency fuel reserves for the first time this year to keep petrol and diesel flowing
