The CIA has released thousands of declassified documents on flying saucers, aliens and other unexplained phenomena.
美国中央情报局（CIA）日前公布了数千份有关飞碟、外星人及其他未解之谜的解密文件。
'We've decided to highlight a few documents both skeptics and believers will find interesting,' the agency said on its website.
The post continued: 'Below you will find five documents we think X-Files character Agent Fox Mulder would love to use to try and persuade others of the existence of extraterrestrial activity.'
All of the documents are dated from the late 1940s to the 1960s, but were top-secret until now.
One of the files attached to the post is a document from East Germany in 1952, where agents were called to investigate what witnesses described as a 'huge flying pan'.
The object was said to have a diameter of about 15 meters, according to the document.
Similar flying saucers were also spotted in North Africa and Spain, the report said.
'The picture [of the object] shows a diagonal stripe of diminishing width and lighter in shade than the sky over the dark bulk of a building cornice,' it was noted.
Included with some of the documents were three pictures of the alleged extraterrestrials.
One of the photos - taken by British student Alex Birch in 1962 - claimed to show a group of flying saucers flying over the city of Sheffield in the UK.
