A footage from ISS live stream shows a mysterious object, a tiny white speck emerging from the darkness just above Earth's horizon. It  travels for two seconds then the live stream cut out and followed by a statement, asking users to stand by due to technical issues.

"'Please stand by. The High Definition Earth Viewing experiment is either switching cameras, or we are experiencing a temporary loss of signal with the International Space Station."

While many viewers maybe didn't notice anything out of the ordinary, UFO hunters claim the extraordinary footage shows the appearance of a mysterious spacecraft.

"This was found on the official ISS channel it appears a UFO comes into frame and the feed it then immediately cut," wrote YouTuber ColdPyro.

According to reports, the flying object can only be spotted for a moment, since it emerges around the 5-second mark, just to the left of center in the frame, and then the live stream went dead just two seconds later.

This isn't the first time UFO hunters have spotted strange and mysterious object near the ISS. Last month, alien admirer claimed that he saw a strange light in the live stream. According to him, it was a glowing blue UFO traveling close to the space station.

Back in September, there was an argument that footage from the ISS showed two UFOs flying around a progress capsule, a component that's used to supply the station.

It's the truth that it isn't always possible to figure out what these objects really are, considering that they appear just for few seconds in the stream. However, there are many possible explanations for these types of sightings.

Nasa rep has explained, "Reflections from station windows, the spacecraft structure itself or lights from Earth commonly appear as artefacts in photos and videos from the orbiting laboratory."

As conspiracy theorists claiming NASA is covering up proof of a UFO.