Article Photos: Preparation for mass shooting events responsibility of police and public, Oklahoma officials say 23/47

Heavily armed Connecticut State troopers are on the scene at the Sandy Hook School in Newtown, Conn. where authorities say a gunman opened fire, leaving 27 people dead, including 20 children, Friday, Dec. 14, 2012.  (AP Photo/The Journal News, Frank Becerra Jr.) MANDATORY CREDIT, NYC OUT, NO SALES, TV OUT, NEWSDAY OUT; MAGS OUT ORG XMIT: NYWHI118