NORTON (CBS) – Investigators are seeking the public’s help determining how a 5-alarm fire started at an abandoned mill building in Norton.

More than 50 firefighters from several towns battled the fire at the vacant building on Barrows Street Wednesday afternoon.

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“Someone knows whether the fire was intentionally set or accidentally set by people who were not authorized to be inside,” Norton Fire Chief Shawn Simmons said.

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Fire burns at abandoned mill building in Norton (WBZ-TV)

Anyone with information is asked to call the Arson Hotline at 1-800-682-9229 or Norton Police detectives.

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Investigators from the Norton Fire and Police Departments and State Police assigned to the Office of the State Fire Marshal are jointly investigating the fire.