New Zealand officials are investigating the possibility that its first Covid-19 cases in more than three months were imported by freight, as the country’s biggest city plunged back into lockdown.

“We are working hard to put together pieces of the puzzle on how the family got infected,” said Director General of Health Ashley Bloomfield.

Investigations were zeroing in on the potential the virus was imported by freight. Bloomfield said surface testing was underway at an Auckland cool store where a man from the infected family worked.

“We know the virus can survive within refrigerated environments for quite some time,” Bloomfield said during a televised media conference.

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