A fire that caused $200,000 in damage to a warehouse on Nebraska Ave. in Columbia Sunday night was caused by a homeless person camping in the area, according to Columbia fire marshals. Firefighters arrived on the scene about 5 minutes after being dispatched about 8:16 p.m. Firefighters forced entry into the building and had the fire under control in about 20 minutes. The building is a warehouse for Columbia Winnelson, a supplier of residential and industrial supplies. The Columbia police will now join in the investigation.