A teenage girl has been arrested after footage emerged of a group of five masked offenders allegedly attacking students outside a school in Melbourne.

Greenvale Secondary College was plunged into lockdown when two students were injured in an alleged affray which began about 3.12pm yesterday.

Police arrested a 16-year-old girl and she was interviewed in relation to attempted armed robbery and affray.

She was spoken to at a police station yesterday evening and has been released pending summons.

Police are investigating after five people allegedly approached students outside the school on Glencairn Drive.

A scuffle broke out and two students sustained minor injuries, police said.

"Police believe one person produced a machete at the scene but it was not used in the affray," officers

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