A TV producer has claimed that astronauts have been prevented from talking about UFO sightings by NASA.

NASA stops astronauts from talking about aliens, TV producer claims

NASA stops astronauts from talking about aliens, TV producer claims

Kevin Burns - producer of History Channel programme 'Ancient Aliens' - has insisted that space fear talking about their extraterrestrial experiences as the agency ''frowns on it''.

Speaking to Daily Star Online, he said: ''We have interviewed NASA astronauts who are convinced that they have seen UFOs and who have confirmed with us that that information has been suppressed. The astronaut Edgar Mitchell was famous for believing in extraterrestrials based on his personal observation. Buzz Aldrin also spoke about it.

''There's a reluctance to confine a lot of this because of NASA, being a government agency, kind of frowns on it.''

During the show, Kevin also spoke of an incident where computer hacker Gary McKinnon claimed to have an image of a UFO from the NASA database, before his machine was mysteriously ''shut down''.