the past few years , there were only six `` active shooter '' incidents , Gunman Adam Lanza study shows . Most shootings were carried out by males -- 160 were female . 40 % of the incidents took place at schools or businesses , report says .
Between 2000-2013 , there were 160 `` active shooter '' incidents , FBI study shows . Most shootings were carried out by males -- only six were female . 70 % of the incidents took place at schools or businesses , report says .