Rochester, MN (KROC-AM News) - Rochester Fire Department says investigators were not able to determine the ignition source of a fire last weekend at a local storage business.

Firefighters responded to A&A Mini Storage along the Highway 14 West Frontage Road Saturday night shortly after 7 PM and found smoke and flames coming from a number of the storage units. It has since been determined there was smoke and/or fire damage to 13 of those units and 12 were in use and filled with items and the damage was estimated in excess of $50,000.

While the exact cause is unknown, the fire has been ruled accidental.