NORTH LAKE — The Waukesha County Sheriff's Department has closed its case on the Dousman Transport fire and could not determine the cause of the blaze.

The fire, which destroyed 34 buses and a bus barn on Oct. 2, originated in one of the buses, according to Capt. Patrick Esser of the Waukesha County Sheriff's Department Detective bureau. But investigators could not determine how the fire started.

“We look more for origin, which we determined was a bus, but we couldn't come up with a cause,” Esser said.

Esser said his department could not determine whether the fire was suspicious because there was not enough evidence pointing in either direction.

Dousman Transport President Rob Nelson said last month that all the buses had been replaced, and he anticipates the bus barn will be rebuilt this spring.

Twenty-five fire departments responded to the fire, and witnesses reported hearing explosions as the buses and structure went up in flames.

The company used buses from its other 10 bus terminals to maintain service for Arrowhead, Kettle Moraine and Mukwonago Area school districts after the fire. Other bus companies lent buses as well.

Esser said the case can be reopened if new information is provided to the sheriff's department.

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