TOPSHAM — The state Fire Marshal’s Office has determined that a fire that destroyed a vacant apartment building was arson.

The fire gutted the four-unit apartment house on Liberty Circle on the Brunswick Naval Air Station annex Tuesday night. No one had lived in the house for several years and there was no power in the building, according to Stephen McCausland, a spokesman for the state Department of Public Safety.

Fire marshals and Navy personnel are inspecting dozens of other unoccupied houses nearby to see whether any fires have been set inside those structures.

Anyone with information about the fire is asked to call Topsham police at 725-4337 or the Fire Marshal’s arson hotline at 888-870-6162.

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