PHOENIX -- Authorities said a teenager was in custody for allegedly threating to injure other students at a high school in the Phoenix suburb of Anthem.
Maricopa County Sheriff's officials said the 18-year-old Boulder Creek High School senior was arrested Monday. He's been booked into jail on suspicion of hoax.
The student allegedly went online and posted a message that he planned to bring a gun to school and shoot other students as part of a senior prank.
A sheriff's posse member who helps the school on security issues obtained information that led to the arrest.
The teen was contacted at his father's house in Anthem and was interviewed by sheriff's detectives and allegedly admitted to posting the threat.