Hamilton's Fraser High School was put in lockdown this afternoon after a youth "known to the school" made threats against staff and students.
Parents of students received the news via text message from the school this afternoon.
The message reads that the school was put into lockdown at 2.23pm because the school was notified that a "youth known to the school, intended to endanger the safety of self, of staff and possibly students".
"The police were called as per protocol."