"You're really powerless. It definitely felt powerless to be sitting there, barricaded and you have no idea where your friends are and you have no idea what's going on," says student Tarun Ramkumar.

A public safety alert warning of an active shooter panicked the University of South Carolina Sunday. Police found no evidence of a shooter.

Active shooter reports recently hit the University of Tennessee, Villanova University, the University of South Carolina, and the University of Arkansas.