Police arrested Joshua Alexander O’Connor, 18, after his grandmother found a journal of his that detailed plans to shoot up his classmates.
Authorities took O’Connor into custody at ACES High School on Tuesday where he faces charges of attempted murder, the Associated Press reported.
His grandmother reportedly called 911 after she found a journal Tuesday morning that had detailed plans to shoot students and deploy homemade explosives on the campus.
Officers who responded to the grandmother’s phone call saw portions of the journal, which outlined plans to make pressure-cooker bombs and other explosives so he could cause as much deaths as possible, court documents state.
“I need to make this count,” O’Connor allegedly wrote, according to the journal entries KIRO obtained. “I’ve been reviewing many mass shootings/bombings (and attempted bombings) I’m learning from past shooters/bombers mistakes.”
“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)s away,” the alleged journal entries continued.
O’Connor is being held in Snohomish County Jail on $5 million bond.
The student’s arrest came the day before 17 people were killed in a shooting at Parkland High School in Parkland, Florida. Police arrested 19-year-old Nikolas Cruz, a former student at Parkland High School, accused of carrying out the massacre.