Fire officials in Hickory are investigating a quick-moving fire that destroyed an old hosiery plant. More than a dozen firefighters were called to Highland Avenue in northeast Hickory shortly after 3 a.m. Wednesday. When they arrived, flames were burning through the roof of the old plant. Firefighters said a homeless woman was staying in the building at the time of the blaze. The cause of the fire has not been determined but no injuries were reported.