University officials in Iowa, meanwhile, said they were still determining how to react to the tragedy. "It's a little too premature to comment at this time ... and we do not have all the facts. But it's definitely a horrific, horrific tragedy," Iowa State University spokeswoman Annette Hacker said.
Contributing: Patrick O'Driscoll, Martin Kasindorf, John Ritter, Dennis Cauchon, Lindsay Nash of the Asheville Citizen-Times; Maureen Milford of The News Journal in Wilmington, Del.; and Perry Beeman of The Des Moines Register.