In total, the country has reported 1,238 confirmed cases and 22 deaths.
Authorities are warning that the number of cases are likely to increase, raising the prospect that a three-day lockdown in Auckland could be extended and putting the date of the country's upcoming general election in doubt.
For months, life was largely back to normal, and the country went 102 days without a locally acquired case.
But on Tuesday, New Zealand reported that a family of four in Auckland had been infected with coronavirus, despite having no history of overseas travel and no connection with any known cases.
For months, New Zealand has imposed strict immigration controls -- aside from some exceptions, the border is closed to all non-New Zealanders, and anyone entering the country must spend 14 days in a state quarantine facility.
Authorities have used genome sequencing to investigate the source of the outbreak, but have found no link between the community cases and imported cases in New Zealand's managed isolation quarantine facilities, Bloomfield said.