Shocking UFO sighting above US Navy base in the California desert

These stunning pictures appear to show an alien spacecraft hovering in the air over the desert and have been seized upon by the UFO community.

They were taken by a man using the pseudonym “Keith Bradshaw”, who says he went out to the desert near the Naval Air Weapons Station China Lake in California after being told about the craft by a friend.

He snapped the pictures in 2007 – but says he has been too nervous to show them until now.

“This thing would wobble along close to the ground, very unstable,” he said.

“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.”

Keith said that he watched the craft for about ten minutes. He also claimed he saw the silver UFO while a number of military vehicles were parked nearby.

There was even a military helicopter flying around at the time.

“I don’t believe anyone could have been riding on the inside, but I got the idea the helicopter was somehow remotely controlling it,” he said.

“It looked like whoever was controlling it was having fun with it, sometimes because they would do little tricks with it.”

By opening the pictures up to the world now, Keith hopes to open the conversation about whether we’ve been visited by extraterrestrials – or whether it was simply some new kind of military hardware that he witnessed.

He provided the pictures to 54-year-old UFO sleuth Philip Mantle, who says he hasn’t seen anything like this in over 40 years of research.

Mr. Mantle has described them as “the most controversial UFO photos on record” and adds experts are unable to agree if the photographs are real.