DULUTH — Investigators are looking for the cause of a fire at an apartment building in Duluth that displaced dozens of tenants.

Deputy Fire Chief Erik Simonson said 30 to 50 people have lost their homes, but no one was seriously injured in the blaze Sunday afternoon. The 20-unit, three-story apartment building is a total loss with damage estimated at $900,000.

Simonson said a few people were treated for minor smoke inhalation. The Red Cross is helping tenants with shelter, transportation, clothing and food.