Residents across the top of the North Island say they've seen flashes of a large blue light and a loud bang.
Many are speculating that it was a meteor.
Radio New Zealand has been told that people in Coromandel, Northland, and all across Auckland witnessed the event.
North Shore resident Jon Torgersen said the first light was yellowish followed a few minutes later by a reddish flaming light.
He said about 15 minutes later at about ten o'clock there was another very bright light followed by a loud sound.