Two investigations are under way after botched home circumcisions that resulted in 10 boys being taken to hospital - one of whom required surgical treatment.
The Ministry of Health and police are investigating after Middlemore Hospital attended to 10 boys, of whom eight were admitted to the Starship children's hospital this month.
The ministry understands that the individual of interest is now outside New Zealand, said its chief legal adviser, Phil Knipe.
The boys, all around the age of puberty, are thought to have had circumcisions performed by the same man, understood to be a visitor from Tonga who is not registered as a medical practitioner in New Zealand.
"We had eight patients who were admitted because of complications from botched circumcisions," said Starship spokesman Gilbert Wong. "They were done in a medically inappropriate manner. They had infections afterwards."