Secret FBI files have been released detailing how US officials saw a UFO explode over Utah – and aliens land near Roswell in New Mexico.

美国联邦调查局（FBI）近日解密了一批文件，其中详细记录了美国犹他州不明飞行物（UFO）爆炸事件，以及新墨西哥州外星人着陆的“罗兹威尔”事件。

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Images of aliens autopsied by the US military at Roswell in 1947 were a hoax.
A declassified² document from 1949 tells how three men, on patrols miles apart, each reported seeing a UFO break up over mountains north of Salt Lake City.

Their extraordinary accounts were sent to Edgar Hoover, the director of the FBI, in a memo³ titled "Flying Discs".

The file said that a policeman, a highway patrolman and an army guard all "saw a silver coloured object high up approaching the mountains at Sardine⁴ Canyon⁵" that "appeared to explode in a rash of fire."

"Several residents [reported] seeing what appeared to be two aerial（空中的） explosions, followed by falling object," it said.

The file is one of thousands of previously⁶ unreleased files that the FBI has made public in a new online resource called The Vault⁷.

Among them is a 1950 statement from special agent Guy Hottel, which seems to provide evidence for the theory that aliens landed at Roswell, New Mexico.

In the memo, Agent Hottel said that "three so-called flying saucers had been recovered in New Mexico".

He wrote that the flying saucers were "described as being circular in shape with raised centers, approximately 50 feet in diameter."

In a statement that is reminiscent of（令人回忆起） the hit 1990s TV programme The X-Files, he went on to describe the alien life forms inside the UFOs.

"Each one was occupied by three bodies of human shape but only 3 feet tall," he wrote.

The bodies were "dressed in a metallic⁸ cloth of a very fine texture⁹. Each body was bandaged in a manner similar to the blackout suits used by speed flyers and test pilots."

Agent Hottel suggested that the UFOs had crashed in New Mexico because high-powered government radar¹⁰ had interfered¹¹ with their operating systems.

The release of the files are likely to intensify¹² the claims of conspiracy¹³（阴谋） theorists who believe the US government covered up alien landings.