U.S.

Profiling Mass Shooters And Assessing Threats

Saturday, police who are investigating gunman Adam Lanza in a deadly shooting in a Connecticut school announced they expected to piece together a picture the gunman's actions as well as his motives. Host Guy Raz speaks with NPR's Shankar Vedantam about how Lanza fits the profile of the mass shooter, and whether the recent tragedy can tell us how to avoid the next one.