but when it s young people, it s even worse. repor to a close with no arrest. any time a life is lost, it s a tragedy. but when it s young people, it s even worse reporter: not releasing a motive, police are puzzled by the gunman why would the teenager open fire a killing spree that took three lives including a little boy wha festival with his family. was gunned down while celebrating at a festival with his family miguel almaguer, nbc news, gilroy, california i m gadi schwartz in gilroy where today bags of evidence were seized along with a tactical rifle case pulled from pulled from the family home of 19-year-old sant the family home of 19-year-old santino william legan less than a mile from where he opened fire on a crowd of people our preimminent and principle concern at this point is motivation, ideological this p motivation, ideologi leanings, was he affiliated with anyone or any group? reporter: in a post from his now deleted instagram profile, the shooter mentioning a