It was at 05 o'clock on Friday morning that the police were alerted about an injured man in his 30s at Flora's hill in Luleå.
The man was taken to hospital with serious but not life-threatening injuries.
Two released
Shortly after the alarm, two people were arrested who were later arrested by prosecutors.
During Friday and the weekend, the investigation has continued with interrogation and house search and the two people have now been released.
A third person, suspect 3, on the other hand, is still being arrested on suspicion of aggravated assault and aggravated weapon crime.
The prosecutor now has until Tuesday 12:00 to either request that the man be detained or set him free.