There has been a spate of thefts from and damage to vehicles between Malmsbury and Gisborne in the early hours of Monday morning.
Senior Constable Matt Fitzgibbon, from Kyneton police, said at 6.20am that police had already received 10 reports, but expected more to come in as the morning progressed.
More offences are understood to have been committed further towards Sunbury and Melbourne.
The offenders, who police believe are responsible for all the incidents, stole a late model silver Holden Commodore station wagon from Gisborne about midnight.
Police believe they continued to use this vehicle as they committed the other crimes.
Anyone who has been affected or has information is asked to contact Kyneton police on 5421 2900, or their local police station.