TVNZ headquarters in Auckland were evacuated after an incident this evening, delaying the regular nightly news by half an hour.

Photo: RNZ / Tom Furley

Emergency services were called to the scene on Victoria Street in central Auckland at about 5.30pm.

The road was cordoned off between Hobson and Nelson Streets.

Photo: Screenshot / TVNZ

About eight fire trucks were on the scene, as well as a hazmat unit.

A fire service worker on the scene said heavy smoke had clogged the building.

It was not clear what caused the fire.

A person who worked inside the building said they were evacuated after an alarm went off.

The 6pm news bulletin - which is broadcast live from the studio in Auckland - was delayed by half an hour due to the evacuation.