Bern police used pepper spray on a group of protestors outside the Iranian Embassy yesterday.
Police say the atmosphere was tense, and officers used the spray after demonstrators refused to reopen the road to traffic.
One person required medical attention and was treated by paramedics.
Earlier, three men entered embassy grounds without authorization.
One was detained and taken to a police station, while two others remain at large.
Geneva hosts two vital diplomatic meetings today
Snowfall grips Alps - high avalanche warnings almost everywhere
Snow derails train - injures 5
Train travel remains disrupted in Lausanne
High franc - high cost for business
Economy grows a little
