U.S. universities and colleges have stepped up security since the Virginia Tech shootings in April 2007. But do students feel secure? Some CNN.com readers say the efforts have helped, but more needs to be done. Others say plainly that students are still too vulnerable to attack inside the classroom. full story
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Readers: Why mass killings happen This week's deadly shooting at Northern Illinois University leave police, campus officials and students with many unanswered questions.
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