On December 14, 2012, a gunman opened fired inside Sandy Hook Elementary School in Newtown, Connecticut. The shooting killed 20 first-grade students and six educators.
The video shows how easy it is to miss the signs of someone planning a shooting and encourages us all to pay more attention.
The public will get its first glimpse of the Newtown, Conn., school built to replace the one where 20 first-graders and six educators were massacred.
