But authorities have yet to find any evidence linking Cho to any of his victims

Great Falls Tribune - www.greatfallstribune.com - Great Falls, MT: "State Police spokeswoman Corinne Geller said investigators don't know how long the doors to Norris Hall were chained shut in what might have been a practice run that Saturday. But authorities have yet to find any evidence linking Cho to any of his victims on the Blacksburg campus. Investigators have not located Cho's cell phone or the hard drive to his computers, which could answer that question and others, said Virginia State Police Superintendent Col. Steve Flaherty. "