NORCROSS, Ga. (AP) - Gwinnett County fire investigators say a fire at a business in Gwinnett County was caused by arson. Gwinnett County Fire and Emergency Services spokesman Capt. Tommy Rutledge says firefighters brought the fire at a shopping center on Jimmy Carter Boulevard in Norcross under control early Friday. Rutledge says firefighters found heavy smoke pouring from the front of the business on arrival.