It was shortly after 20:00 on Sunday evening that several police resources were alerted to Skelleftehamn, where a man was found injured in a stairwell.
The man was taken to hospital by ambulance where he is being treated for his injuries.
The police started a preliminary investigation into serious assault, but have now changed the classification to suspected attempted murder, according to norran.se.
A person has been brought in for questioning, suspected of complicity in the crime, according to the newspaper.