A fire on the slopes of Grandfather Mountain has grown, officials said Sunday. The fire is estimated to be 350 acres and 10% contained, the U.S. Forest Service said. The cause of the fire remains under investigation, but U.S. Forest Service officials believe it to be caused by someone, WCNC-TV reported. Forest Service spokesperson Lisa Jennings said yesterday that the fire is in a remote area, so the fire service is expecting it to increase in size within the containment area until we get a significant rainfall. The important thing, she added, is that firefighters have protected any homes and structures and none of that area is at risk anymore.