MINNEAPOLIS (WCCO) – Authorities say a construction waste company in Blaine sustained significant damage in a fire Friday night.

The Spring Lake Park-Blaine-Mounds View Fire Department responded to a report of a structure fire at about 6:15 p.m. Friday, located in the transfer facility at Dem-Con. When crews arrived, firefighters observed a heavy fire through the roof of the building.

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(credit: Spring Lake Park-Blaine-Mounds View Fire Department )

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The roof collapsed shortly after firefighting efforts started. Crews from several other departments responded with four ladder trucks, multiple engines and about 25 personnel to provide assistance.

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Crews returned to the scene on Saturday to put out hot spots. There were no reports of any injuries. The cause of the fire is under investigation.