NEWTOWN, Conn. (AP) - The mass killing inside a Connecticut elementary school has educators across the country reviewing their security measures and reassuring parents through text messages, emails and phone calls that their buildings are safe.
Driven by previous school shootings, many district officials say they already lock building doors, require identification from visitors, employ safety officers and have systems to notify parents of trouble.
Some rely on metal detectors and cameras.
But for all the preparation, experts say there are no guarantees.
The heightened vigilance was evident Friday when a New York City school was locked down after students reported seeing a man they didn't recognize. He was servicing the copy machine.