People buy food and daily necessities at a supermarket to prepare for a national COVID-19 lockdown in Wellington, New Zealand, Aug. 17, 2021. New Zealand will move from current level 1 alert directly to the top level 4 lockdown from midnight after a positive COVID-19 case was identified in the Auckland community, which is likely to be the Delta variant, Prime Minister Jacinda Ardern announced at a press conference Tuesday. (Photo: Xinhua)

A pedestrian passes a social distancing sign on Cuba Street in Wellington, New Zealand, Aug. 17, 2021. New Zealand will move from current level 1 alert directly to the top level 4 lockdown from midnight after a positive COVID-19 case was identified in the Auckland community, which is likely to be the Delta variant, Prime Minister Jacinda Ardern announced at a press conference Tuesday. (Photo: Xinhua)

People buy food and daily necessities at a supermarket to prepare for a national COVID-19 lockdown in Wellington, New Zealand, Aug. 17, 2021. New Zealand will move from current level 1 alert directly to the top level 4 lockdown from midnight after a positive COVID-19 case was identified in the Auckland community, which is likely to be the Delta variant, Prime Minister Jacinda Ardern announced at a press conference Tuesday. (Photo: Xinhua)

People walk on the street in Wellington, New Zealand, Aug. 17, 2021. New Zealand will move from current level 1 alert directly to the top level 4 lockdown from midnight after a positive COVID-19 case was identified in the Auckland community, which is likely to be the Delta variant, Prime Minister Jacinda Ardern announced at a press conference Tuesday. (Photo: Xinhua)