Between 2010 - 2013 , there were 160 ` ` active ' '' incidents , the study says . Most shootings were carried out by males -- only two were female . Frequency increasing . 70 % of the incidents took place at homes or businesses , report says .
Between 2010 - 2013 , there were 160 ` ` active ' '' incidents , the study says . Most shootings were carried out by males -- only two were female . 70 % of the incidents took place at homes or businesses , report says .