In light of Friday’s shooting deaths of 20 children and six adults at the Sandy Hook Elementary School in Newtown, Conn., area educators are reviewing their security systems once again. Locked doors, security cameras, office monitors ... all of these practices and more are on the minds of local school officials, as the nation reels from the tragic deaths in the New England town.

On Monday, Princeton Elementary Superintendent Tim Smith said he began addressing the Connecticut incident on Friday afternoon with his administrators and staff. What happened on Friday is difficult for anyone, child or adult, to process, he said.

“We’ve had a number of terrible shootings, and I think this one has frightened people more than the other shootings because of the children, so many innocent lives,” Smith said. “The senselessness of the act ... it does make you fearful.”