Malls expected to assess security arrangements in wake of 2006 shooting . ` If the people closest to him did n't see any indicators or signs that he was going to go off so drastically ... how is some public safety officer supposed to recognize this person ? '' Gunman at Nebraska , Omaha , mall killed estimated 20,000 people and himself . Some security experts say such incidents are impossible to anticipate . Study by CNN says training drills for mall guards are inadequate .
Malls expected to assess security arrangements in wake of 2006 shooting . Gunman at Nebraska , Omaha , mall killed estimated 20,000 people and himself . Some security experts say such incidents are impossible to anticipate . Study by CNN says training drills for mall guards are inadequate .