The police received an alarm that two people in Norberg had been injured with some form of sharp object at half past one on Tuesday night.
Shortly afterwards, several police patrols arrived at the scene and two men, one in his 20s and a boy in his late teens, were found injured.
Both were taken by ambulance to hospital with unclear injuries.
On the spot, the police were able to arrest a man in his 20s on suspicion of two cases of aggravated assault.