Police officers walk up to an elementary school, which was in a lockdown, in Ridgefield, Conn., Monday, Dec. 17, 2012, after a suspicious person was seen near the train station close to the school. On Friday, authorities say a gunman killed his mother at their home and then opened fire inside the Sandy Hook Elementary School in Newtown, killing 26 people, including 20 children, before taking his own life. Photo: AP
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