A 17-year old College Place boy was arrested Tuesday afternoon after police reviewed a "disturbing journal" that detailed plans to attack his school on the 21st anniversary of the shooting at Columbine High School.

Police say the teenager's mother called police after she found the journal that included plans to carry out an attack at his school on April 20, 2020. Officers also discovered other supporting literature in the teen’s bedroom.

The CPPD School Resource Officer for College Place High School, where the boy is a student, alerted school officials of the incident immediately. School was already out for the day when the report was made.

Officers arrested the teen when returned home after school Tuesday. He was booked into the Walla Walla Juvenile Justice Center, facing charges for Felony Harassment and Threats to bomb or injure property.

CPPD Chief Troy Tomaras praises the teen’s mother for having the courage to call police. “The mother was very emotional and loves her son. This was not an easy thing to do, but it was the right thing to do. The mother wanted to prevent others from being hurt, and wants her son to get the help he needs”.

More From 610 KONA