Every year thousands of people come forward claiming they have spotted UFOs flying across our skies. Unfortunately, the vast majority of such videos uploaded onto the internet prove to be hoaxes.
But there are at least five occasions where UFO sightings have been confirmed by governments without any real explanation. These include four videos released by the US Pentagon, and one photograph found in the national archives of Costa Rica.
Do these images confirm the existence of extra-terrestrial visitors to our planet? Even governments can't explain what they are. Here, we take a look at some clear images of these sightings.
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