A student at Black Hills High School told police Monday his friend, also a student at the school, shared with him a plan to shoot their fellow students before killing himself, The Olympian of Olympia, Wash., reported Tuesday.
The student who made the threats, and whose name wasn't reported, was arrested Monday and was being held at Thurston County Juvenile Jail, police said. Pending a "safe to be at large" evaluation of the boy, bail would be set at $100,000.
Tumwater Police Detective Jen Kolb said investigators found the weapons, possible gunpowder and fireworks in the boy's Tumwater Hill home, and also discovered the teen had been researching the 1999 Columbine High School shooting in which two students killed 12 students and a teacher before killing themselves.
The boy told police Monday he had only been joking about the threats he made against his fellow students.
His mother and grandmother said he had been treated recently for depression.
"My son has had some depression issues and I believe this may have been just a cry for help. ... I do not believe he's a threat. I know my son more than anyone," his mother said Tuesday in court.