Alien invasion? Mysterious UFO hovers above American navy base [VIDEO]

The images of the mysterious objects hovering over California navy base have been described as "the most controversial UFO photos on record".

UFO in California
A screen grab from the video

A mysterious flying saucer-style craft has been spotted floating above the California navy base and it has sparked the news of a possible UFO being spotted. A man, who is known only by the pseudonym Keith Bradshaw, has released five images in a bid to discover the truth about aliens.

The images, taken in the Californian desert, have been described as "the most controversial UFO photos on record". According to reports, Bradshaw clicked the photographs near the Naval Air Weapons Station China Lake in 2007, but apparently he was extremely nervous to show those to anyone.

Reportedly, he sneaked out to the desert after an old friend working on the Navy base told him about the mystery craft. Bradshaw claims that he heard a helicopter as he approached the base, before he saw the silver UFO with a number of military vehicles parked nearby.

The "flying saucer" reportedly hung up in the sky for about 10 minutes. "This thing would wobble along close to the ground, very unstable. Then it would freeze in position, go up to a certain height and sit there for a few minutes perfectly still. It made no noise that I could hear," Bradshaw told Express.

"I don't believe anyone could have been riding on the inside, but I got the idea the helicopter was somehow remotely controlling it. It looked like whoever was controlling it was having fun with it, sometimes because they would do little tricks with it," he added.

Bradshaw has already sent the images to some of the world's top UFO experts for analyzing the authenticity.

Meanwhile, British UFO sleuth Philip Mantle said: "This could turn out to be one of the most controversial UFO photo-cases on record."

"The photo-analysts contacted cannot come to an agreement about these photos. Are they fake or genuine? Who knows," he added.

Jason Gleaves, an ex-RAF and BAE Airbus division employee based in the UK, told Express that he believes they could be genuine. However, he added: With technology of today and software, you can't be 100 percent sure of image authenticity, no matter how good it looks."

Dr. Bruce Maccabee, an-ex US Navy physicist, said: "That is not enough evidence to prove either way that the object was not an unusually shaped drone operating under control of the person(s) flying the helicopter."

Tobias Lingren of Sweden's Aviation Authority added: "I'm not sure the military is so stupid to fly in an open space a 'flying saucer' if they want to keep it secret but I still have no idea what the object could be."