All travellers entering New Zealand will be required to self-isolate for 14 days on arrival as the country locks down to ward off the spread of coronavirus.

Prime Minister Jacinda Ardern announced the measure - which will be effective from midnight Sunday - after an emergency meeting of cabinet.

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“We do not take these decisions lightly,” she said.

“New Zealand will have the widest-ranging and toughest border restrictions of anyone in the world.”

File image of New Zealand Prime Minister Jacinda Ardern. Credit: Kai Schwoerer / Getty Images

This will also include New Zealand citizens, however, those arriving from the Pacific Islands are exempt.

Ardern also announced cruise ships would not be allowed to dock in New Zealand until June.

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The restrictions will be reviewed in 16 days.

New Zealand has just six cases of the disease to date, and none that have been transmitted through the community.

Earlier on Saturday, the government announced the cancellation of a national remembrance service in honour of the Christchurch mosque attacks, which took place on March 15 last year.

- With AAP