A Ventura County high school has closed after authorities investigated a threatening note found on campus.
Sheriff's Captain Don Aguilar says someone called 911 after discovering the note shortly after 8 a.m. Thursday at Moorpark High School.
Deputies were on the scene and the high school was locked down for nearly two hours.
Students in certain areas of the school were evacuated from classrooms and led outside, while other students remained in their classrooms as deputies searched around the campus.
Aguilar says a student with mental health issues may have made the threat.
About 2,000 students attend the school 60 miles northwest of downtown Los Angeles.