"A four-year-old Oro Township boy died of asphyxiation Monday after he became trapped in a snow tunnel. Robert Prince, son of Robert and Shirley Prince of Oro Station, slid into the snow tunnel shortly after 9 a.m. Monday, according to Ontario Provincial Police. Constable Charlie Crawford said Robert and his three-year-old brother went out to play around 9 a.m. About 10 a.m., the younger boy came in and told Mrs. Prince that Robert was struck in the snow. He was dead when found by his mother, police said. Constable Crawford said the boys had been playing in a snow "fort" consisting of a horizontal tunnel and a small vertical one. Robert was wedged in the vertical one. Constable Crawford said the boy vomited, then choked. Constable Crawford said the fort was a solid structure, and was not in danger of collapsing. But he warned parents to supervise small children who play in snow forts."