These pictures are fake, though they're supposedly based on eyewitness accounts.
I know this because I remember seeing a TV show about the use of computer graphics to "recreate" UFO sightings, and these were the pictures that they created.
You know, it's impossible to be 20 ft from a camera these days - either somebody's digital camera, or a survellance camera, or the stupid little cameras people have on their cell phones, now. If we can get upskirt photos every time Paris Hilton wears a thong, we should be able to get good UFO shots.