Police said there were making follow-up enquiries following an incident at Glendowie College this afternoon, involving one student.
"We understand the school initiated a self-imposed lock down, but that has since lifted.
"Police have located the student concerned and the school is assisting police with enquiries to ascertain what happened."
Local MP Simon O'Connor told Stuff he was alerted to the lockdown from a parent, who had told him there was a person at the school with a knife.
However, police said that to their knowledge, no weapons were involved in the incident.
The Herald is attempting to contact the school.