Campuses seeking better, quicker notification system

In the wake of this week's massacre at Virginia Tech, authorities are examining better ways to let students know when something has happened on campus:

"When you're in the middle of something, two hours is not very long. But when you're looking in, it does seem like a long time," says Mitchell Celaya, the assistant chief of campus police at the University of California, Berkeley.

At UC Berkeley, Celaya says an extreme emergency would warrant, among other things, a siren on an outdoor public address system, followed by an announcement with instructions.