‘Columbine’ author’s provides analysis on Florida high school shooting

PARKLAND, Fla. -- Charges are now filed against the suspected gunman in the high school shooting in Forida.

Nikolas Cruz is charged with 17 counts of premeditated murder. He is being held without bond.

Seventeen  students and teachers were shot and killed at Marjory Stoneman Douglas High School. Fourteen others are in the hospital.

Dave Cullen wrote the New York Times bestseller "Columbine" about the 1999 rampage at a suburban Denver high school where two teenagers killed 13 of their classmates and themselves.

He did an interview with WGN Morning News Thursday. Watch it in the player above.