The bodies of two children and one woman have been found in a suburban house in Totara Heights, Manukau City.
A seriously injured man has also been taken to hospital.
Police were alerted to the killings by ambulance officers who were called to the scene at about 7am today.
Police have cordoned off the area surrounding the house and are still trying to establish how the three died. They plan
to talk to the injured man this afternoon.