Fire officials say the blaze may have been started by lightning. About 25 acres was on fire Tuesday on top of a steep ridge. About 60 firefighters were working in &dquo;very rough terrain&dquo; at about 3,100 feet elevation. Firefighters had two bulldozers on the scene, although they were having a tough time finding a way to cut a fire line on the steep terrain. Firefighters from Glassy Mountain, other Greenville county fire stations, S.C. forestry personnel as well as Tryon volunteer firemen and the N.C. Forestry Service personnel were all on the mountain fighting the fire.