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Death Toll From California Shooting Rises to 11 as Police Look for Motive -
The Problems of Motives and Research -
9 Victims of San Jose Rail Yard Shooting Identified; Police, FBI Seek Motive -
Nashville Explosion: Possible Human Remains Found, Motive Unknown -
FBI Finds No Specific Motive in Vegas Shooting -
Police Search for Motive in Florida Mass Shooting -
Las Vegas Gunman’s Girlfriend Says No Advance Knowledge of Massacre