** FILE ** Thousands of students monitor a convocation at Worsham Stadium on the campus of Virginia Tech University in Blacksburg, Va., in this April 17, 2007 file photo. Virginia Tech officials could have saved lives if they had quickly warned the campus that two students had been shot to death and their killer was on the loose, a panel that investigated the attacks said. Instead, it took administrators more than two hours to get out an e-mail warning students and staff to be cautious. The shooter had time to leave the dormitory where the first two victims were killed, mail a letter, and then enter a classroom building, chain the doors shut and kill 31 more people, including himself. (AP Photo/Amy Sancetta, File)