Nashville School Shooter Planned Massacre for Months, Fired 152 Shots.

The shooter in the deadly attack at a private Christian school in Nashville had planned it for months, according to journals police found. The shooter fired 152 rounds, killing six people, including three 9-year-old students. Police have not yet established a motive, but say the shooter "considered the actions of other mass murderers." The investigation into the shooting is ongoing.