A man armed with a knife wounded several people in the streets of the northern Swiss town of Zofingen on Wednesday before being detained, police said.
Police did not give the number of casualties or any details on the attacker.
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The man first lashed out at a passer-by at the railway station in the town of 12,000 people in the Aargau canton, about 60 kilometres (38 miles) west of Zurich.
He then wounded several people seemingly at random before entering a house, police said in a statement.
After two hours of negotiations with a specialised team, the man was arrested, police said. The suspect had been injured, police said.