Geneva police raided a pizza restaurant on Saturday evening following reports of someone brandishing a gun.
Scores of heavily armed officers together with a dog unit sealed off the restaurant on the rue de Savoises near the Plainpalais.
The restaurant is currently closed due to financial difficulty. The police say there was an argument between the owner and two others.
No details of the potential charges have been released.
Govt ready to step in on train staff attacks
Police have to disclose nationality of offenders
Valais bar association says no new fire laws are needed
Major Swiss firm to cut jobs
Post your ballots on time
This winter was significantly warmer than average
