Parents of students at Lone Hill Middle School in San Dimas are concerned after an Instagram account surfaced, made by someone threatening to kill a student.
A high school in Manhattan Beach will be closed Tuesday after a second day of threats against the school, authorities said.
A private school in Orange County will remain closed for a third day Thursday after the school received an email threatening a shooting on the campus.
St. Mary of All Angels, a school in Aliso Viejo, who was on the receiving end of an emailed-in threat Monday.
A 15-year-old boy has been arrested for allegedly making an online threat to shoot students in the Santa Clarita Valley.
A 12-year-old boy has been arrested and taken to a hospital for evaluation after allegedly threatening to shoot 23 students at a teacher at a San Diego-area middle school.