The MoD department, which has dealt with more than 12,000 reports including 135 last year - was used to assess threats posed by any Unidentified Flying Objects sightings throughout Britain.
Any reports made would now not be investigated or followed up as the hotline had been closed, a spokesman said.
UFO experts expressed anger at the decision. Nick Pope, former UFO Investigator at the Ministry of Defence and now independent world known UFOlogist discusses the UFO Files Released by UK National Archives. Top scientists and academics attend a conference organised by the Royal Society - the UK's national academy of science.
UFOs on top scientist's agenda
Show: The Hub Station: BBC World News Date: February 18th, 2010 Subject: 5th Release of UK UFO MOD Documents
18th February 2010- http://www.mirror.co.uk/news/latest/2...
Flying Toblerones, mysterious illnesses and "silky-white substances" are among hundreds of close encounters described in previously top-secret files released by the Ministry of Defence (MoD).
More than 6,000 pages of material spanning from 1994 to 2000 holds hundreds of other-worldly experiences with unidentified flying objects (UFOs) and apparent aliens across Britain.
Aircraft of all shapes and sizes have been witnessed flying over a wide range of locations - including Chelsea Football Club and the former Home Secretary Michael Howard's home in Kent.
One man told police he was physically sick and developed a "skin condition" after an eerie "tube of light" enveloped his car in Ebbw Vale, in Wales, at 10.40pm on January 27 1997.
The file, the fifth released under a three-year project between the MoD and The National Archives, consists of 24 records of sightings, letters and Parliamentary Questions.
Highlights include a man who arrived at his Birmingham home at 4am on March 20, 1997, to discover an illuminated blue triangle hovering over his garden. The craft shot off leaving behind a "silky-white" substance on the tree-tops, which he collected in a jam-jar.
And a West Lothian electrician who spotted a "Toblerone-shaped" UFO hovering over a field. A sketch of the craft is included in the report.
Experts believe the records highlight how shapes of reported UFOs have changed over the last half-century.
Dr David Clarke, author of The UFO Files and senior lecturer in journalism from Sheffield Hallam University said: "In the 1950s the next big leap in technology was thought to be a round craft that took off vertically and it's intriguing to note that this is the same period when people began to report seeing 'flying saucers' in the sky