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.
More Swiss firefighters head to France
A second team of 33 firefighters from French speaking Switzerland will travel to south-western France this weekend to relieve colleagues battling the wildfires.
French wildfire smoke drifts
Smoke from the wildfires ravaging south-western France has drifted into Switzerland, the federal weather service MétéoSuisse says.
Unions demand hot weather orders
Geneva's construction workers remain on the job despite soaring temperatures, prompting fresh criticism from the SIT union.
Brighter economic prediction
Switzerland's short-term economic outlook has brightened in July, according to the KOF barometer released yesterday.
Annemasse municipal police attacked
Two Annemasse municipal officers have been attacked by a woman this week, in the latest incident to fuel concerns about violence in the cross-border town.
Geneva and Vaud have the cheapest pools
Geneva and Vaud have the cheapest public pools, according to a new comparison of 268 sites released as another heatwave bakes the country.
