Christchurch Police have arrested and charged a 15-year-old youth with aggravated robbery.

The action comes after the J-Mart Dairy in the suburb of Opawa was targeted on April 13.

Two males had entered the dairy and robbed the sole attendant of cash and cigarettes while armed with a tomahawk and a kitchen knife.

The youth was to appear at the Christchurch Youth Court today, and police would oppose bail.

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The youth currently has an active charge for another robbery.