He did not report the UFO, although he said he had seen the same sort of aircraft above his flat several months ago as he entered the building in the evening.
Greater Manchester Police confirmed no other sightings on August 2 in Bury had been reported to them.
But the Bury Times and Radcliffe Times did receive another report that mystery flashes of light had been witnessed.
Mr Warner added: “I do not know whether those aircraft were extraterrestrial or owned by the government, but whatever they were they were they were not something I was supposed to see.
“I began researching online and found so many theories about governments supp-ressing alien activity over the years.”
Stephen Mera, chairman of Manchester's Association of Paranormal Investigators & Training, said the organisation received no reported incidents in Bury on the same night.
He said: “We obtain around 300 reports each year over the whole of Greater Manchester and Bury has been a location of previously reported incidents to us.
“Often if the object was seen in or passing through a cloud base we can deduce the approximate altitude of the unknown object – on August 2 in Bury there was Stratus Cumulus cloud at around 7,000 feet.
“The location of the Bury sighting is a known flight path, linking with incoming civilian airliners to Manchester International Airport.”
Mr Mera said anyone reporting an unidentified flying object should give details such as direction, traversity and length of sighting.
He said from this information UFO specialists can often deduce numerous rational explanations – be those technological, environmental, astronomical or meteorological.
Mr Mera added: “We do still have sightings that still defy rationality.
“It is not unheard of for the military to run test flights of exotic or secret aircraft or drones, but the chances of such tests taking place over a busy populated location is rather slim.”
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