In the remarkable footage – filmed above Toronto in Canada – four giant bright lights are seen in the night sky.
The furthest object to the left slowly moves above the skyscrapers and houses and is thought to be a helicopter.
But the three other lights remain in the same position for several minutes.
Alien enthusiasts SecureTeam10 posted the clip to their YouTube channel yesterday (June 10).
“The source of this said the things made no sound and just sat there for five minutes before disappearing,” said Tyler Glockner, who owns the site.