At half past one on Monday night, an alarm came on a fire in a two-level villa outside Luleå.
Emergency services, police and ambulance were alerted to the scene.
"The rescue service made the assessment that the building was overcrowded and had to burn down to the ground," said Johan Lindgren, RLC commander at the police on Monday morning.
No person was injured. The police prepare a report on fire without suspicion of crime.