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Intriguing UFO footage has emerged amid claims it shows an alien spacecraft being sucked into a portal as it travels to another dimension.

The bizarre 45-second video appears to show a swirling white vortex forming next in the blue sky, becoming smaller as it coils.

A sound similar to that of a large aeroplane or powerful jet flying low overhead is heard as a man's voice says: "Oh yeah. That's just insane.

Eighteen seconds in, as the 'vortex' continues to shrink, a small, glowing ball of light appears in the bottom left of the shot.

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The spherical UFO rises quickly, travelling straight to the centre of the 'portal'.

(Image: YouTube / Misterio Channel)

Once there, it appears to be swallowed by the white formation, which promptly disappears without a trace, leaving nothing but blue sky.

The video was uploaded to YouTube by Misterio Canal (Mystery Channel) on Tuesday and has been viewed thousands of times.

It's unclear where it was filmed.

The clip appears with the title: "Dimensional portal in the sky absorbs a UFO".

However, people seem unsure of its authenticity.

(Image: YouTube / Misterio Channel)

One apparent believer wrote: "My respects!!" while another added: "Interesting!!!"

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But another suggested "digital effects" had been used to create the footage, while someone else said it resembled a "Disney movie".

"It's a tornado," wrote another commenter.