A woman who brandished a pistol inside a Dunedin dairy this week hot-footed it from the shop within seconds of entering.

Police were called to the On The Spot Halfway Bush Convenience Store about 7.30am on Monday.

Footage has emerged showing a woman entering the store and brandishing a weapon, which the storekeeper described as "looking like a pistol", then bolting almost immediately.

Meanwhile, the owner fled into the adjoining flat, locked the door and called for his family to phone the police.

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The offender was described as a 20-30-year-old female with an olive complexion, solid build, and about 155cm tall. She was wearing a red scarf covering part of her face, tracksuit pants and black and white gym shoes.