Sandy Hook Elementary School

The efforts to place ‘sentinels’ in schools has only happened so recently that no one currently serving on a school board was elected to that office based on their position on this issue.

Recalling the shooting rampage that killed 20 first graders as the worst day of his presidency, President Barack Obama on Sunday pledged to put his "full weight" behind legislation aimed at preventing gun violence.

A gunman at a Connecticut elementary school killed more than two dozen people, including children, on Friday. It is among the world's worst mass shootings. Here is a look at some others.

It's the latest in a string of far too many killings in schools. By mid-day Friday, one count at Sandy Hook Elementary School in Newtown, Connecticut had 27 dead, 18 of them school children.