Hamilton’s Frankton School was locked down for more than half an hour this morning due to a “pre-planned” police operation.
Police said one person was arrested at an address in the Frankton suburb.
“Cordons were put in place and a local school was advised by police to go into lockdown as a precaution.”
Cordons have since been lifted but officers remain at the scene.
An alert on the school’s website advised parents and caregivers of the event at 9.05am.