NASA has been on the receiving end of allegations of UFO coverups.

Early last year, UFO watchers claimed that the U.S. space agency deliberately cut a live feed from the High Definition Earth Viewing (HDEV) cameras that are mounted on the International Space Station (ISS) in an attempt to hide what they think are sightings of alien spacecraft getting near the Earth's orbit.

Now, NASA is again accused of hiding evidence of an alien spacecraft.

On July 9, a live streaming video from the ISS offered a glimpse of a mysterious object descending from space entering the Earth's atmosphere. The feed though was suddenly cut and was replaced by a message on screen telling viewers that there was a momentary technical glitch.

On Saturday, UFO hunter Streetcap1 uploaded a clip of the video on YouTube.

"[A] UFO is an unidentified flying object. This could well be a meteor or the like," Streetcap1 said. "What made it interesting was the camera cut off when the UFO seemed to stop."

Streetcap1's post did not say that the unidentified object is an alien probe but the video has been reposted with insinuations that the U.S. space agency intentionally shut down the feed to hide something albeit some think that the mysterious object could be the Chinese space cargo ship Tiangong-1.

NASA is often accused of hiding images and footages of what some claim as proof of alien life. Besides UFOs in ISS videos, conspiracy theorists also claim seeing creatures such as a giant mouse, statues, tomb and a bear-like creature in photos taken by the Mars Curiosity Rover on the Red Planet, which NASA scientists explained were mere optical illusions.

Amid the alleged coverups, NASA said it has nothing to hide. It also has explanations on the abrupt disappearance of footages from the ISS explaining that video streams are sometimes lost because of technical difficulties involved in live streaming from the ISS.

NASA spokesperson Daniel Huot explained that for videos, the cameras will show a blue screen, which means the absence of signal, or a preset video whenever the signal is lost.

He added that things such as space debris, the moon, reflections from the windows of the station, light from the Earth and the structure of the spacecraft itself may be seen as artifacts in videos and photos from the ISS.

"No 'UFOs' in the popular sense have been seen from the ISS," Huot has explained. "Reflections on the station's windows, lights from the spacecraft structure itself or lights from Earth commonly appear as artifacts in photos and videos from the orbiting laboratory, just as reflections often appear in pictures taken through windows here on Earth."

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