How Columbine lessons helped in Arapahoe High School shooting

By The Christian Science Monitor
Saturday, December 14, 2013 10:06 EDT
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Shooting at Arapahoe High School in Colorado [WCPO-TV]
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School and law enforcement authorities learned important lessons from the 1999 Columbine High School shooting in Littleton, Colo., which were evident Friday in another school shooting just a few miles away at Arapahoe High School in Centennial, Colo.;

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