Out of all the case files made public by the FBI online, the most popular is a memo from 1950 titled FLYING SAUCERS," the agency said this week. The mysterious report from Guy Hottel, special agent in charge in Washington, begins with this: "An investigator for the Air Force stated that three so-called flying saucers had been recovered in New Mexico. They were described as being circular in shape with raised centers, approximately 50 feet in diameter. Each one was occupied by three bodies of human shape but only 3 feet tall." The name of the source is blacked out. Over a million people have looked at the sensational memo online. The account goes on to say that the bodies were "dressed in metallic cloth of a very fine texture. Each body was bandaged in a manner similar to the blackout suits used by speed fliers and test pilots." Although the file was first released in the 1970s, it was posted online in 2011 as part of the Vault. The London tabloid The Sun said the memo appeared to back the claim that extraterrestrials landed in Roswell, New Mexico. But in a new commentary posted this week, the FBI said that since this memo was dated three years after the supposed Roswell landing, "there is no reason to believe the two are connected." The memo is part of a cache of hundreds of pages of accounts under the heading "Unexplained Phenomenon," describing claims of UFO sightings, spacecraft debris and alien landings.