A man suffered knife wounds to his face and hands at a block of flats in Norwich.
Police officers were called to a home in Canterbury Place shortly before 4.30am on Monday to reports a man had been stabbed.
The injured man, aged in his 30s, was taken to the Norfolk and Norwich University Hospital with minor injuries to his face and hands.
He has been released from hospital.
A man aged in his 40s was arrested at the scene and taken to Wymondham Police Investigation Centre for questioning.
He has since been released under investigation while enquiries continue.
A Norfolk police spokesman said: 'Officers continue to try to establish the circumstances around the incident; however police believe those involved were known to each other.'
Officers patrolled the street and spoke to neighbours for several hours on Monday following the incident, with some people stating they had left at around 4.30pm.
One neighbour, who did not want to be named, said the altercation happened at the upper floor flat with a boarded-up door, but that the damage to the front of the property had been there since Christmas. She said: 'My husband saw the police at around 5.30am outside the door.
'It's not want you want happening where you live, but I haven't heard anything about it.'
Another neighbour, who wished to remain anonymous, said there had been up to six officers at the scene knocking on doors throughout the day.
A police forensic van was parked nearby as police officers roamed the block of flats.
But many of the residents at the estate had not heard the commotion during the early hours of the morning. One man said: 'There were two officers stood outside the flat door when I left for work at 6.30am, it wasn't cordoned off or anything.
'I didn't hear anything last night but there were rumours that a man had been assaulted.'
Another man added: 'I was making a drink in the kitchen and I saw police looking at me from the railings. 'The didn't tell us about what happened, just that enquiries were ongoing but we didn't hear anything.'
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