Eerie footage has emerged showing a mysterious 100 metre-wide black ring of smoke floating over clear skies in Kazakhstan - convincing locals it was caused by a UFO.

The clip was filmed on Saturday in Shortandy village, 40 miles north of the capital Astana, and captures the cloud hovering in the sky for 15 minutes before suddenly vanishing without trace.

The video has been viewed more than 50,000 times since being uploaded to YouTube, prompting all manner of bizarre explanations for the phenomenon - with many seemingly convinced it is definitive proof of extra-terrestrial life.

Truly bizarre. To read more and view the video, click here.