A 12-year-old has been referred to Youth Aid after a group of teenage boys allegedly held up a milk bar in Gore.
A machete was used in the October 5 robbery and a shop assistant was injured.
Four teenage boys, aged 16, 14 and two aged 15, are due to appear in the Invercargill Youth Court on Friday.
The 12-year-old will be referred to youth aid.
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Police thanked members of the community who provided useful information.