Between 2000-2013 , there were 160 `` active shooter '' incidents , FBI study shows . In 2007 , Virginia Tech student Seung-Hui Cho shot and killed 32 people and wounded dozens more in a classroom building and a dorm on campus before killing himself . " The number of mass shootings in the US has increased by over 300% since 2000. 70 % of the incidents took place at schools or businesses , report says .
Between 2000-2013 , there were 160 `` active shooter '' incidents , FBI study shows . " The number of mass shootings in the US has increased by over 300% since 2000. 70 % of the incidents took place at schools or businesses , report says .