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A sketch of a UFO drawn by a witness in Napier in October, 1954.
Thousands of secret reports on New Zealand UFO sightings have been released, detailing mysterious unexplained sightings from the public and military personnel.

The files include every witness account of unidentified flying objects reported to authorities since early 1952, including the infamous 1978 Kaikoura mystery.

View New Zealand's UFO files here

Detailed in more than 2000 pages of files are letters from people who claim to be in touch with alien beings, sketches from witnesses and media reports.

Some of the earliest reports come from the president of the Civilian Saucer Investigation (New Zealand) group, Harold H. Fulton, thanking a witness who wrote to him about a sighting.

The witness had seen a "strange, bowl-shaped object that he saw fall from a clear sky".

"As the object fell it made a hissing sound, hit the wharf pier he was standing on and then bounced high and landed on a Government survey vessel," the letter said.

The files had been held by Archives New Zealand, which was to make them available in February after requests from the public, but the Defence Force stepped in saying it needed to remove personal identification to comply with the Privacy Act.

Access to the original files will be restricted until the year 2050 at the earliest for personal privacy reasons.

Before their release, Squadron Leader Kavae Tamariki said the Defence Force would not comment on the files' content.

"We've just been a collection point for the information. We don't investigate or make reports, we haven't substantiated anything in them."

The Defence Force did not have the resources to investigate UFO sightings, Tamariki said.

The director of research group UFOCUS NZ, Suzanne Hansen, said she had been trying to get hold of the files for nearly two years.

"I started lobbying, and at first they said there was no way in the foreseeable future they'd be released. It's been a long time coming."

Hansen said she hoped the files would reveal more detail about some of New Zealand's most famous cases, including the Kaikoura sighting on December 21, 1978.

Wellington man John Cordy, 77, was in the air traffic control tower on that night and still maintains there was no logical explanation for what happened.

He and his colleague witnessed inexplicable radar readings at a time when no aircraft were cleared to be in the area.

At the same time, crew on an Argosy cargo plane reported strange lights around their aircraft, which tracked them for more than 60 kilometres. Numerous theories were put forward, but Cordy said none fitted the bill.

There were also several sightings from military personnel.

In June 1961, Flight Lieutenant B. Hildreth saw a "bright opalescent green disc" near Renwicktown in the Wairau Valley.

After the sighting he reported severe pain in his eyes. Tests were taken and his eye condition was put down to an infection.

The sighting, which happened at 2.45am, was described as a "disc surrounded by greenish mist which moved with it".

Further reports on the files will become available later in the day.