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The footage was caught on a woman’s motion sensor camera at her home in Parshall, Colorado, US.

It shows the green object hurtling to the ground in the night sky, much like any normal meteor.

But then something truly bizarre happens.

The object suddenly makes a 90-degree angle turn and zooms to the left, before disappearing.

The motion sensor camera manages to track the “craft” before it vanishes.

Blake and Brett Cousins, of YouTube channel thirdphaseofmoon, were sent the footage by a follower after it was taken on June 15.

“It looks like this thing moves so fast that the tracking position fell off the mark,” Brett said in the clip.

“I have never seen anything that can move this fast unless it is alien in origin.”

(Image: YOUTUBE/THIRDPHASEOFMOON)

Blake added: “Can you imagine the distance when it comes from the atmosphere down and makes a harsh bank to the left.

“It is covering miles and miles of space within a split-second.”

The pair dismiss claims that the object could be a “comet” or “ball of lightning” – because of the sudden turn of speed.

More than 6,000 people have seen the clip since it was posted yesterday, with some viewers suggesting it may have been caused by the camera suddenly panning left.

But a separate angle seems to show the camera did not move when the object veered off.

“Absolutely amazing UFO footage controlled movement comets don’t bank left this is fantastic worth getting on the news Television,” one believer wrote.

Another commented: “That’s the best video I have ever seen.”

A third added: “Yep definitely UFO and not a flare.”

It is not the only mysterious sight to have emerged in recent weeks.

A bizarre "alien-like" winged creature was spotted hanging from a ceiling in Bali.