Woman, 74, allegedly threatened with knife in car jacking

Members of the public have performed a dramatic citizens' arrest in Geelong after an alleged carjacking yesterday.

Police said a 74-year-old woman was in her car at traffic lights at the intersection of Shannon Avenue and Church Street in Hamlyn Heights abut 5.15pm when a woman approached her car.

It's alleged the woman threatened the elderly victim with a knife before forcing her out of the car.

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The woman got into the vehicle before several witnesses swarmed the car and held her down until police arrived.

A 27-year-old woman from Norlane has since been charged with aggravated carjacking.

She has been remanded to appear at Geelong Magistrates' Court later today.