Health NZ and the police are investigating the death of a child in Auckland, reportedly after a routine tonsil operation at Southern Cross hospital.
The New Zealand Herald reports the six-year-old child died in Starship Hospital on Monday, after complications from the surgery last week.
In a statement, Southern Cross Healthcare said it was supporting Health NZ's review.
Southern Cross Healthcare chief medical officer Dr Erica Whineray Kelly said the organisation was devastated over the child's death.
"Our thoughts are with the child's family and whānau during this incredibly sad and difficult time.
"Patient safety is always our highest priority, and we are supporting a review initiated by Health New Zealand - Te Whatu Ora to ensure we understand all factors involved."
Group director of operations at Auckland City Hospital Mike Shepherd said Health NZ extended its deepest sympathies to the family.
The police confirmed officers attended a sudden death at Starship Hospital about 7pm on Monday.