Photos: Sandy Hook Elementary School shooting in Newtown, Connecticut The children were too young to understand what it meant when they heard the gunfire Friday outside their classroom at Sandy Hook Elementary School in Newtown, Connecticut, said kindergarten teacher Janet Vollmer.Photo by: Newton Bee/CNN Newsource Photos: Sandy Hook Elementary School shooting in Newtown, Connecticut Principal Dawn Lafferty Hochsprung's career seemed to be peaking when she became principal two years ago of Sandy Hook Elementary School in Newtown, Connecticut.Photo by: Courtesy CNN Photos: Sandy Hook Elementary School shooting in Newtown, Connecticut As the family of slain Sandy Hook school psychologist Mary Sherlach mourned her death, Trooper Orlando "Lonny" Mo was the one who brought back her car and personal belongings.Photo by: Screengrab from ABC news video Photos: Sandy Hook Elementary School shooting in Newtown, Connecticut Friday morning, Adam Lanza walked into Sandy Hook Elementary School in Newtown, Connecticut, dressed in 'black battle fatigues and a military vest' and began firing.Photo by: WPTV Photos: Sandy Hook Elementary School shooting in Newtown, Connecticut Adam Lanza stayed at home mostly, a witness said, playing video games such as 'Call of Duty.'Photo by: NBC Conn. Ustream player Photos: Sandy Hook Elementary School shooting in Newtown, Connecticut A woman holds a child as people line up to enter the Newtown Methodist Church near the the scene of an elementary school shooting on December 14, 2012 in Newtown, Connecticut.Photo by: Douglas Healey/Getty Images Photos: Sandy Hook Elementary School shooting in Newtown, Connecticut Police escort parents leaving staging area after being reunited with their children following a shooting at Sandy Hook Elementary School, Newtown, Connecticut.Photo by: AP Graphics Bank Photos: Sandy Hook Elementary School shooting in Newtown, Connecticut  Shooting At Elementary School In Newtown, Connecticut.Photo by: By: Douglas Healey Photos: Sandy Hook Elementary School shooting in Newtown, Connecticut Map locates Newtown, Conn.Photo by: CNN Photos: Sandy Hook Elementary School shooting in Newtown, Connecticut Photo by: CNN Photos: Sandy Hook Elementary School shooting in Newtown, Connecticut Photo by: AP Graphics Photos: Sandy Hook Elementary School shooting in Newtown, Connecticut Connecticut State Police walk on Dickson Street from the scene of an elementary school shooting on December 14, 2012 in Newtown, Connecticut.Photo by: Douglas Healey/Getty Images Photos: Sandy Hook Elementary School shooting in Newtown, Connecticut 18 children were among those killed when a gunman entered Sandy Hook Elementary School and began firing.Photo by: WVIT Photos: Sandy Hook Elementary School shooting in Newtown, Connecticut A shooting at a Connecticut elementary school happened on Dec. 14, 2012Photo by: CNN Photos: Sandy Hook Elementary School shooting in Newtown, Connecticut Photo by: WPTV Photos: Sandy Hook Elementary School shooting in Newtown, Connecticut Connecticut State Police responded to reports of a shooting at a Newtown elementary school Friday, Dec. 14, 2012, in southwestern Connecticut, according to police spokesman.Photo by: CTNow/CNN Photos: Sandy Hook Elementary School shooting in Newtown, Connecticut Connecticut State Police responded to reports of a shooting at a Newtown elementary school Friday, Dec. 14, 2012, in southwestern Connecticut, according to police spokesman.Photo by: CTNow/CNN Photos: Sandy Hook Elementary School shooting in Newtown, Connecticut Connecticut State Police responded to reports of a shooting at a Newtown elementary school Friday, Dec. 14, 2012, in southwestern Connecticut, according to police spokesman.Photo by: CTNow/CNN Photos: Sandy Hook Elementary School shooting in Newtown, Connecticut Woman talks on phone as she waits to hear about her sister, a teacher, following shooting at Sandy Hook Elementary School, Newtown, ConnecticutPhoto by: AP Graphics Bank Photos: Sandy Hook Elementary School shooting in Newtown, Connecticut Photo by: CNN