A zoomed-in image of the UFO that was spotted in Peru on 10 FebruaryYouTube grab

Unknown Flying Objects (UFO) have been a topic of discussion for decades, with several sightings being reported from around the world, but it still remains a mystery as no notable organisation has thrown in enough evidence to support the claims.

Now, a former Canadian defence minister has claimed that governments worldwide are resorting to cover up.

Speaking to about 400 people at the "Disclosure Canada Tour" at the University of Calgary last week, Paul Hellyer who served as the defence minister of Canada in the 1960s, and other speakers on the tour, expressed their wish that the government release information they have on UFOs, reported CTV

Hellyer, 91, told the gathering at the event organised by a group called Modern Knowledge that UFOs are frequently seen in the skies like airplanes and governments have been hiding the presence of an alien in 2005. He also said that he took part in the tour with the aim of spreading his views on UFOs.

"Much of the media won't touch it," Hellyer told CTV. "So you just have to keep working away and hope that someday you get a critical mass, and they will say, in one way or another, 'Mr. President or Mr. Prime Minister we want the truth and we want it now because it affects our lives.'"

Interestingly, The Huffington Post reported that a crew of American military personnel had a close encounter with UFOs during the Vietnam War in 1968. The crew aboard a patrol boat reportedly saw two "glowing circular craft" or objects over another boat, which was destroyed following a flash of light. 

Former Air Force intelligence officer Capt. George Filer said that the military was interested in the UFOs as they wanted to know the kind of technology they used.

"Frequently, the Vietcong or North Vietnamese would be attacking an outpost and I would explain that, and we would have ground-air support, particularly at night where we'd go in there with these gun ships, and I would give briefings on all of that," Filer told The Huffington Post. "Some of the time, there would be unidentified craft over the DMZ."