The driver of a bus that passed through Fayetteville late Christmas Eve said he had seen some people throwing "balls of fire" at the house.[4] A few months later, when the snow had melted, Sylvia found a small, hard, dark-green, rubber ball-like object in the brush nearby. George, recalling his wife's account of a loud thump on the roof before the fire, said it looked like a "pineapple bomb" hand grenade or some other incendiary device used in combat. The family later claimed that, contrary to the fire marshal's conclusion, the fire had started on the roof, although there was by then no way to prove it.[6]