There has been a mass escape at the Malmsbury Youth Detention centre.
This is a timeline of what we know so far:
2.45pm: About 30 inmates riot and 15 escape after ramming a fence with a stolen ute
3pm: Six are arrested nearby, while nine go on the run, some in three carjacked vehicles
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3.30pm: A police car and then a civilian car are reportedly rammed
3.45pm: Police call off a high-speed chase after allegedly stolen car drives the wrong way down the Calder Freeway.
4pm: Five youths on the roof of the centre agree to come down. Police lose track of stolen cars.
6.45pm: Two more escapees arrested, reportedly found wandering shirtless in a paddock near the centre.
7pm: About 50 staff released after four hours of lockdown
8pm: Police secure the Malmsbury facility, with at least seven still on the run.