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Seven people had to be rescued from a boat which overturned off Stewart Island yesterday afternoon.
Inspector Mike Bowman said when police attended the incident all seven people on board had been rescued and they were transported to Halfmoon Bay.
"All people were treated for various levels of hypothermia and two [were] transported to Southland Hospital for further assessment," he said.
"Police are very thankful for the quick response provided by the emergency service volunteers and the wider Stewart Island community."
A St John spokesman said two patients were airlifted to Southland Hospital, in Invercargill, in a moderate condition.
Otago Helicopter Rescue Trust chief pilot Graeme Gale said two helicopters were sent after the trust was asked to assist with the incident.
Police said they would assist Maritime New Zealand with inquiries into the incident.