The Duluth News Tribune reports that carbon monoxide levels were detected at five times the normal rate. The Northland News Center says the propane-powered Zamboni machine and the arena's aging heating and water systems might have all been factors. (Photo courtesy of Northland News)
No word yet on the condition of the people who went to the hospital or when the arena will be safe. Calls to Fryberger went unanswered Thursday afternoon.