The stay-at-home order for the city of almost two million was issued on Sunday after three community cases emerged, the first lockdown in Auckland for almost six months.
Ardern earlier in the day accused Australia of abdicating its responsibilities by "unilaterally" cancelling the citizenship of the detained woman, who had held both New Zealand and Australian citizenships.
“Given the risks in the world around us and the uncertainty of the global rollout of the vaccine, we can expect our borders to be impacted for much of this year,” Ardern said at a news conference.
New Zealand's first case of the coronavirus after months has been identified as the South African variant of the virus.
The woman, who recently returned from Europe, tested positive on Saturday, 10 days after she completed her mandatory two-week self isolation period, at a hotel in the city of Auckland.
COVID-19 Response Minister Chris Hipkins said the health ministry has purchased nine large minus 80 degree Celsius freezers that can store more than 1.5 million doses of the Pfizer-BioNTech vaccine.
“The commission made no findings that these issues would have stopped the attack. But these were both failings and for that I apologise,” Prime Minister Jacinda Ardern said after the report was released.
The report revealed Tarrant was treated by doctors in Dunedin city in the months leading up to the attack after accidentally shooting himself, but staff never alerted police to his injuries.
Ardern met with the family members of victims and some survivors on Sunday and promised immediate action on the royal commission report, but said some recommendations may take time to implement.
The findings of a royal commission inquiry into the mosque attack will be made public in parliament on Tuesday.