Crestwood Intermediate and Secondary School in Peterborough was placed in a brief lockdown Tuesday afternoon after a student entered the building with a large rock, damaged school property and made threatening comments.
In a letter sent to families, school officials confirmed the incident happened shortly after noon on October 20.
According to the school, a student described as being in distress entered the building carrying a large rock and began damaging property.
The student also reportedly made threatening comments, prompting staff to contact police and initiate lockdown procedures.
Students were kept inside their classrooms as a precaution while officers responded to the school.
Police arrived shortly afterward to investigate the situation and remove the individual from the building.
The lockdown was lifted at approximately 12:30 p.m.
