State fire officials have joined the investigation into the blaze in Madelia, Minnesota, which destroyed businesses on its Main Street.
Fire officials in Madelia requested the help of the Minnesota Department of Public Safety's State Fire Marshal Division, as it investigates the fire that started in the early hours of Wednesday.
The blaze destroyed at least seven buildings and damaged several others in the small town, about 25 miles southwest on Mankato.
The emergency response was hampered by the heavy snowfall on Tuesday, which made it hard for first responders to get to the fire.
The State Fire Marshal Division has warned the investigation is likely to take "months to complete," noting that fire investigations of this nature are "complex."
At least eight businesses suffered damage, including: Culligan Water, Kay’s Upholstery, Hope and Faith Floral and Gift, La Plaza Fiesta Mexican Restaurant, American Family Insurance, a dental office and a hair salon, City Administrator Jane Piepgras told the St. James Plaindealer.
The Star Tribune reports that Governor Mark Dayton will pay a visit to the town on Friday, touring the worst-hit areas with business owners.