A search is underway for two people aboard a twin-engined aircraft that ditched in the sea off Kawhia after reporting engine failure.
The plane was reportedly registered to 2Degrees CEO Eric Hertz.
The emergency call was made about 12.20pm.
Rescue Coordination Centre (RCC) sent the Westpac Helicopter from Auckland to investigate the last known position of the aircraft.
It found an oil slick and wreckage about 11 nautical miles (20km) north west of the entrance to Kawhia harbour, near Gannet Island.