Three more staff members at the Americold warehouse facility in Auckland have tested positive to coronavirus.

Americold Managing Director of Australia and NZ, Richard Winnall, says the three people worked alongside a man in his 50s who has already tested positive to the virus, ABC is reporting.

He says all staff from the facility are isolating.

Auckland is at alert level 3 and the rest of New Zealand is at alert level 2 after it was announced yesterday that there are four positive cases and four probable cases of Covid-19 outside of a managed isolation or quarantine facility.

This morning Mount Albert Grammar principal Patrick Drumm told Morning Report student from the school tested positive for Covid-19.

Director-General of Health Ashley Bloomfield confirmed that the student was a close contact of the four existing South Auckland cases.

Meanwhile, Police Commissioner Andrew Coster says people who are leaving Auckland for the wrong reasons are being turned back.