The alarm came at 1 a.m. Sunday morning. The fire was quickly extinguished and four people were taken to hospital.
Region Värmland stated on Sunday that a woman in her 35s is seriously injured and is being treated in the intensive care unit.
Three children were also injured in the fire. Their condition is stable, according to the region.
The residence was cordoned off for a technical examination. The police cannot rule out that a crime is behind the incident and a preliminary investigation into arson has been opened.
