Several yachts have capsized during a regatta in north Otago, with an unknown number of people ending up in the water.
A police spokeswoman said emergency services were called at 12.05pm to Lake Aviemore with a report several yachts had capsized amid high winds. Coastguard, police and ambulance were attending.
One person was being checked for potential hypothermia, she said. As of 1.35pm everyone was out of the water - it was not clear how many people had fallen in.
A St John Ambulance spokeswoman said two vehicles attended the incident and 16 people were assessed.
Of those 11 had minor injuries, five were not injured.