Warning signs may have been missed in school shooting case

Attendees comfort each other at a vigil on Thursday for the victims of the shooting at Marjory Stoneman Douglas High School at Parkland Baptist Church in Parkland, Fla. (AP Photo/Wilfredo Lee)

PARKLAND, Fla. — Months before authorities say Nikolas Cruz walked into his former high school and slaughtered 17 people, the troubled teen began showing what may have been warning signs he was bent on violence.