Grandmother reports grandson for school shooting plot in Washington

A grandmother called 911 to report her grandson's school shooting plot.

— -- A grandmother in Washington state is being credited with reporting her own grandson for planning a school shooting. The teen was arrested the same day as a former student killed 17 people in a shooting at a Florida school.

“What I’m reporting is I’m finding journal entries from my grandson,” Catherine O’Connor told the operator. “And he’s planning on having a mass shooting at one of the high schools.”

O’Connor’s 18-year-old grandson, who has not been identified by police, was a student at Aces Alternative High School in Everett, Washington.

ABC's Seattle affiliate KOMO obtained court documents detailing his violent journal entries.

“I need to make this shooting/bombing ... infamous," the student wrote, according to the court documents. "I need to get the biggest fatality number I possibly can. I need to make this count. ... I'm learning from past shooters/bombers mistakes, so I don't make the same ones."

The grandmother called police when she discovered her grandson’s journal as well as a semi-automatic rifle stored in a guitar case in her home, according to court records.

Another journal entry stated, "I'm preparing myself for the school shooting. I can't wait. My aim has gotten much more accurate. ... I can't wait to walk into that class and blow all those (expletive) away."

His journal also had excerpts about making pressure cooker bombs.

He is being held on $5 million bail at Snohomish County Jail. Police are still investigating the teen for attempted murder based on his journals.

“There's a lot of kids who could have lost their lives,” O’Connor’s neighbor Julie Primachik told KOMO. “I think it’s a hero-like thing to do.”