Teen who planned school massacre: I'm mentally ill

The teen who was just days away from carrying out plans for a school massacre detailed his plot to police.

17-year-old John LaDue tells investigators he was looking for "as many victims as possible." He was planning to kill his family, set off bombs at his Minnesota high school, and shoot countless students.

Minnesota teen who planned school massacre: 'I think I'm really mentally ill'

Luckily, LaDue's plan was thwarted. Chelsie Schellhas was credited for thwarting this young killer's massacre. In an interview with CNN's Erin Burnett, Schellhas explains what happened the day she encountered LaDue.