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A police spokesman confirmed to the Otago Daily Times AOS were taking part in the pre-planned warrant as a precaution.
A reporter at the scene said there were five police cars, a police van, as well as officers and AOS members involved in a search of a property on Ontario St.
The police and AOS members could be seen going in and out of the house.
This comes after a member of the public reported seeing police and AOS gathering at the nearby Mataura River bridge in Gore.