Since the Columbine school shooting in 1999, active shooter attacks are up from 6 to 20 per year in the United States, and they’re becoming more deadly – the attack in Las Vegas last year was the worst domestic act of terror to date with 58 fatalities and 841 people injured.

In total 100,000 people are shot in the U.S. every year. They’re victims of active shooter attacks, drug and gang violence, or accidental discharge, and total $2.8bn in hospital charges....
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