Crime and Punishment: How an alleged school massacre plot was thwarted

Authorities in Minnesota say a 17-year-old planned to kill "as many students as he could" at his high school. Police say the plot involved guns and bombs, and the teen would have started by killing his own family. Anderson spoke to a woman who called 911 after spotting the suspect acting suspiciously.

Susan Candiotti has the latest on today's arrest.