Coeur d'Alene firefighters are investigating what caused a fire at self-storage facility Sunday.

The fire broke out Sunday afternoon on Appleway near I-90.

Workers at U-Haul and nearby businesses spotted smoke coming from the roof and called 911.

Crews arrived to find the fire burning in a crawl space between the ceiling and the top of the building. 

The fire was contained to the business office and shipping area. None of U-Haul's tenants lost any belongings.