An unusual aircraft has been spotted flying across the sky, leading keen space-watchers to wonder whether they had seen a UFO.

The white, cylinder-shaped object was spotted on the same day as "high-speed" objects were caught on a space radar, reportedly near NASA's International Space Station.

YouTube user MrMBB333 uploaded the two incidents in a video titled "Ok, something is CLEARLY roaming the skies of this planet!", in which he showed the two sightings side-by-side.

He claimed that on September 9, someone called Mary Hall had spotted "high-speed objects moving through the field of view from the International Space Station" during both the daytime and nighttime sides of the screen.

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