A mystery 'Halo' cloud has appeared in the skies over Mexico, resulting in speculation of a UFO visit to the central American state.
The circular cloud was captured by an amateur cameraman above Mexico on February 11, and the video comments on YouTube suggest that it could be a hole punched in the sky by an alien craft.
It isn't the first time such a cloud formation has been spotted, after a similar mystery 'Halo' formation was spotted in the skies over Moscow late last year.
Some internet UFO enthusiasts have maintained that the cloud is absolute proof of a UFO visit, while others think it may be a porthole through which alien ships could enter the Earth's atmosphere.
Even the Met Office has been left baffled by the mystery cloud, or its causes, with spokeswoman Sarah Holland stating: "Aircraft exhausts could play a part in the freezing process but the precise cause is unknown."
Some believe that the phenomenon in Mexico can be explained as a result of a meteorite punching through the cloud layer. UFO expert Nick Pope adds "The similarity with the so-called Halo cloud seen recently over Russia is striking. One possibility is that a meteorite or fireball punched through the cloud.
"This could explain the strange sound reported and the fact that a crater was apparently found."