Heavily armed police officers stormed a private apartment in Champel in Geneva on Sunday night.
Police say they were called to the residence as a very heated argument had broken out. A police spokesman says they intervened in such force as they were reports of a bladed weapon.
One woman had already been injured and was outside the building waiting for help to arrive.
A man was arrested.
Borrowing costs increase
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Majority reluctant to give up cars
Only 6% of Swiss residents say they would be willing to sell their car to fight climate change
Wide variation in property valuations
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VAT increase on pensions being considered
Switzerland will decide on 29 November whether to raise VAT to pay for the 13th state pension
Second language debate
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Lake Geneva steamships at risk
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