Student arrested in plot to shoot up his Hercules high school

San Francisco police are investigating separate stabbings over the weekend in the Mission District and Chinatown that left two men wounded, including one with life-threatening injuries. San Francisco police are investigating separate stabbings over the weekend in the Mission District and Chinatown that left two men wounded, including one with life-threatening injuries. Photo: Spencer Platt / Getty Image, Getty Image Photo: Spencer Platt / Getty Image, Getty Image Image 1 of / 1 Caption Close Student arrested in plot to shoot up his Hercules high school 1 / 1 Back to Gallery

A 15-year-old Hercules High School student was arrested Thursday night after police found evidence he planned to shoot up his school to get revenge — possibly for being bullied, city officials said.

Around 8:30 p.m., a teacher contacted police after another student told her the teen was talking about his plans for vengeance, said city spokeswoman Margaret Roberts.

Officers contacted the young man’s parents, who agreed to take him to the police station for questioning and allow officers to search their home, although they also had a search warrant, Roberts said.

Inside, officers found “supporting documentation” that he planned to commit the school shooting, Roberts said. She could not provide further details, including whether police recovered a weapon, saying the investigation was ongoing.

“The motive was possibly related to being bullied,” said Roberts, who added that the student had no prior juvenile records.

Marcus Walton, spokesman for West Contra Costa Unified School District, said the district was notified of the incident.

“The district handles these situations like it always does — very carefully with the safety of students and staff being of the utmost importance,” he said.

The student was booked into a juvenile hall in Martinez.

Jenna Lyons is a San Francisco Chronicle staff writer. E-mail: jlyons@sfchronicle.com Twitter: @JennaJourno