Police have arrested a fourth man over the aggravated robbery of a dairy in Nelson last Sunday.

The Victory Discounter Dairy was robbed at gunpoint by masked men on the night of July 16, with the robbers taking cigarettes, tobacco and cash.

At 7.30pm tonight police arrested a 21-year-old man at an address in Atawhai address.

He will appear in the Nelson District Court tomorrow charged with aggravated robbery and unlawfully getting into a motor vehicle.

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Police say they are still looking for the shotgun used in the robbery.

Three other Nelson men aged between 20 and 22 have already been arrested and charged with aggravated robbery.

They have been remanded in custody and will next appear in the Nelson District Court on August 7.