The Federal Intelligence Service says it is monitoring the activities of 41 people who it considers a threat to the security of the country.
In a statement to the SonntagsZeitung, the service says the radical Islamic scene has been expanding in Switzerland in recent years.
It adds it believes the most likely threat is an attack by a lone individual against a weakly protected target such as a crowd or property.
But it also stresses that there is no evidence of an immediate threat at the moment.
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
