Victoria Police believe a man in a grey four-wheel-drive threatened a woman from his car and made demands that she get in his vehicle at about 11.30am.

It is believed the woman refused, and the man drove away from the scene.

Victoria Police said investigators were "working to establish the circumstances surrounding the incident".

Anyone who witnessed the incident or has information has also been encouraged to contact Crime Stoppers on 1800 333 000 or at www.crimestopersvic.com.au.

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