The alarm about the accident came in just before midnight.
– For an unknown reason, the car overturned and ended up on its side, says police spokesperson Angelica Forsberg.
A man in his 25s and a woman in his 40s were in the car. The man, who was driving the car, was seriously injured and taken to hospital by ambulance. The woman suffered minor injuries.
The driver is suspected of serious drunken driving, carelessness in traffic and illegal driving.