A vacant building at 800 Mobile Avenue was destroyed by fire early Thursday. (Courtesy photo)

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No injuries were reported from an early morning fire that destroyed a vacant building Thursday in Port Arthur.

When firefighters arrived at 800 Mobile Avenue at 5:15 a.m., the structure was engulfed in flames, said Port Arthur Fire Chief Greg Benson.

Crews took a defensive operation due to the severity of the fire and condition of the building, which was near residences and under power lines.

The origin is unknown and under investigation.