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Flowers for the victims of the Sandy Hook Elementary School rest at a memorial in Newtown, Connecticut December 18, 2012. U.S.  Authorities continue to investigate the December 14 massacre in Connecticut in which a heavily armed gunman entered Sandy Hook Elementary school and shot and killed 20 children and six adults. The incident, resulting in 28 deaths, including the gunman and his mother, has prompted a fresh debate on U.S. gun control. Joshua Lott/Reuters