the past few years , there were only six `` active shooter '' incidents , Gunman Adam Lanza study shows . `` Recognizing the increased active shooter threat and the swiftness with which active shooter incidents unfold , these study results support the importance of training and exercises -- not only for law enforcement but also for citizens . '' Most shootings were carried out by males -- 160 were female . 40 % of the incidents took place at schools or businesses , report says .
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 .