Routine morning, then shots and unthinkable terror

White balloons decorate the sign for the Sandy Hook Elementary School as a Connecticut State Trooper stands guard at the school's entrance, Saturday, Dec. 15, 2012, in Newtown, Conn. A gunman killed his mother at their home and later walked into Sandy Hook Elementary School Friday and opened fire, killing 26 people, including 20 children. (AP Photo/David Goldman) Photo by STF