"This decision follows a public health assessment today which determined that while the overall risk to public health in New Zealand now remains low, there are still several unknowns", a release from NZ's COVID-19 Response Minister Chris Hipkins said.
New Zealand and several Australian states have announced the removal of travel restrictions imposed last month as dozens of cases were detected in Melbourne and the city endured a two-week lockdown.
As a result of the spike in cases, the NSW Government has extended the mandatory wearing of face masks for another week, with all of Greater Sydney now included. The two new cases take New South Wales' recent community cases to six.
There are now no plans for a lockdown to be introduced, Ms Berejiklian said, because all but one case has been linked to known infections.
"We also need to recognise that this Delta variant... is actually a gold medallist when it comes to jumping from one person to another", Berejiklian told reporters in Sydney.
Both were close contacts of previously reported cases and have been in isolation.
The cases are all linked to each other under what's being called the "Bondi cluster".
The third is a woman in her 20s from Sydney's eastern suburbs.
The seventh case was a student at St Charles Catholic Primary School in Waverley, in Sydney's eastern suburbs.
"We anticipate in coming days ... those in isolation with a household contact are likely to develop the disease given how contagious it is".
"Anyone in New Zealand at the Westfield Bondi Junction mall (including the vehicle park) in Sydney's Bondi Junction on Saturday 12 June between 11am to 12pm or Sunday 13 June between 1pm to 2pm and 4pm to 4:30pm should get tested immediately".
The Westfield Bondi Junction shopping centre continues to be the main area of concern to health authorities.
A further 11 would be required to self-isolate until they return a negative day-five test. Of those, eight have returned a negative test and three are outstanding.
"Unfortunately, a number of people who contracted the virus have done so in a very fleeting way, literally being within less than a metre within somebody", Berejiklian said.