A report released by the F.B.I. on Wednesday confirmed what many Americans had feared but law enforcement officials had never documented: Mass shootings have risen drastically in the past half-dozen years.
More than 480 were killed and 557 wounded in 160 „active shooter“ incidents from 2000-13, it found. Two-thirds of incidents ended before police arrived, though only one ended when an armed citizen not working as a security guard responded with gunfire.
– BBC News