WELLINGTON (Reuters) - New Zealand Prime Minister Jacinda Ardern announced a nationwide lockdown on Tuesday after a new case of COVID-19 was discovered in the biggest city of Auckland.

       The lockdown will run seven days in Auckland, but three days elsewhere. Ardern said authorities were assuming the new case was a Delta variant although this has not been confirmed.

       (Reporting by Praveen Menon; Editing by Clarence Fernandez)