New details emerge a week after school massacre

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School Shooting Predicting Violence
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School Shooting Predicting Violence
FILE - This undated photo shows Adam Lanza in a Newtown High School yearbook photo. Authorities have identified Lanza as the gunman opened fire Friday, Dec. 14, 2012, inside an elementary school in Newtown, Conn., killing 26 people, including 20 children, before killing himself. People figure there surely were signs of impending violence. But experts say predicting who will be the next mass shooter is virtually impossible _ partly because as commonplace as these calamities seem, they are relatively rare crimes. Still, a combination of risk factors in troubled kids or adults including drug use and easy access to guns can increase the likelihood of violence, experts say. (AP Photo)