Eleven people were assessed with minor injuries after several yachts capsized during a regatta on the Waitaki River, on the border of Canterbury and Otago.
The yachts were reported to be racing from Otematata River to the Aviemore Dam.
Coastguard are on the scene, along with police and ambulance staff.
At least one person was treated for possible hypothermia.
St John assessed 16 people in total, with five suffering no injuries.
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