The man was found injured by the police after an alarm about shooting had come in at 00.33.
We have initiated a preliminary investigation into attempted murder and serious weapons offenses, says Per Gottschalk, duty officer at the police.
GP has spoken to a witness who tells that she and her family heard several loud noises in their apartment.
We were standing and talking, when we heard six shots in a row. We thought: "What the hell was that", it was pistol shots, she says.
The injured person was taken to hospital by ambulance, and the police reported on Saturday morning that his injuries were serious but not life-threatening.
A short time after the shooting, a boy under 18 years old was arrested for the crime, the police write on their website.
Police work at the crime scene is ongoing.
It's a technical investigation and witness interviews, among other things. We always conduct door-to-door questioning, says Ramsmo.
