A 17-year-old student has gone on a rampage, damaging property and terrifying students at Copperfield College in Melbourne's north west.

Police were called to the school around 1.50 in the afternoon as students were enjoying their lunch break to a report of a teen who had armed himself with a piece of wood, smashing up windows on several buildings.

When they arrived he threatened them, but they were later able to calm him, and he was eventually taken from the scene in an ambulance. Fairfax Media understands the student, who is enrolled at Copperfield College, may have been having a mental health issue at the time of the attack.

No one was injured, and the school was quickly placed in lockdown. Scared students reported hiding in the library, while some claim they were chased by the teen.