Article Photos: Preparation for mass shooting events responsibility of police and public, Oklahoma officials say 20/47

Law enforcement canvass an area following a shooting at the Sandy Hook Elementary School in Newtown, Conn. where authorities say a gunman opened fire, leaving 27 people dead, including 20 children, Friday, Dec. 14, 2012.(AP Photo/Jessica Hill) ORG XMIT: CTJH112