UFO hunters are having a field day after a mysterious black flying object was filmed stalking the California skies in broad daylight.
The footage taken by a bystander has been seized upon by conspiracy theorists who claim it is further proof alien spacecrafts are visiting earth.
UFO enthusiast Jesse of YouTube channel UFO News claims the object could be an alien spacecraft which became exposed after its cloaking mechanism failed.
The 34-year-old from Oregon, US, said: "UFOs have long been theorized to possess some type of cloaking mechanism that would make them invisible to the human eye.
"Perhaps what we witnessed was the failure of a similar mechanism, accounting for the highly visible movement over such a populated area."
To read more and view the video, click here.