South security check point at Denver airport shut while police investigate potential security concern

Former Columbine principal's advice is sought after Fla. shooting

February 28, 2018, 7:24 am

After school shootings like the massacre at Marjory Stoneman Douglas High, administrators reach out to former Columbine High principal Frank DeAngelis for advice, since there is no book to teach what he learned after gunmen killed 12 of his students and a teacher in 1999.

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