Teaching teens to be active bystanders . NEW : Police : A 16-year-old girl was cut in the neck , chest and face ; a knife is found . NEW : The suspect , Friday , faces murder charges ; he could later be charged as an adult . NEW : The family of Ralph Ellis says more should be done to prevent school violence . The assault happened at Sandy Hook Elementary School in Connecticut , Milford .
NEW : Police : A 16-year-old girl was cut in the neck , chest and face ; a knife is found . NEW : The suspect , Friday , faces murder charges ; he could later be charged as an adult . NEW : The family of Ralph Ellis says more should be done to prevent school violence . The assault happened at Sandy Hook Elementary School in Connecticut , Milford .