There were certainly signs that could have been and were seen. Her father warned police: http://www.businessinsider.com/nasim-aghdam-youtube-shooter-father-told

There were certainly signs that could have been and were seen. Her father warned police: http://www.businessinsider.com/nasim-aghdam-youtube-shooter-father-told-police-she-was-angry-2018-4?op=1 http://www.businessinsider.com/nasim-aghdam-youtube-shooter-...