"Mr Greenwood spoke to local news reporters about the incident but became frightened about speaking out when two weeks after the incident two men claiming to be government officials knocked on the door of his home.
'One in plain clothes, and the other one, senior air force,' Mr Greenwood said.
The men told the teacher he was mistaken about what he saw and had he 'really seen anything'.
'Absolutely, I was threatened. I was told that I should not say anything about it,' Mr Greenwood said.
'When I tried to explain to them that they weren't there, I was and I knew what I saw, well, the first suggestion was that you'd be ill advised to go on saying that because clearly you were drunk on duty and will have to be reported to the education department and of course you will lose your job.'
A year after the Westall incident Mr Greenwood was interviewed by an American physicist, Dr James E. McDonald, who was known for his study of UFOs - he says at he instruction of the office of the then-President of United States, Lyndon B Johnson.
'The president had authorised the establishment of a board of inquiry, or an inquiry to inquire into issues of unidentified flying objects, and that they were sending out someone,' he said.
The US began investigating UFO sightings and the phenomenon soon after the Second World War, when sightings began."
Källa 30 maj 2021:
Westall UFO on April 6 1966 Melbourne teacher gagged 200 saw UFO | Daily Mail Online
