The fast-moving fire broke out around 12:00 a.m. Thursday at the Mill Creek Village Apartments on Scarborough Drive in Elsmere, Delaware.
One person was treated at the hospital for smoke inhalation.
Investigators say the fire was caused by discarded smoking materials, which ignited surrounding combustibles inside a basement apartment.
Damage was limited to the apartment where the fire originated.
Initial estimates are quoted at $15,000 in damages.
