Aliens inserted "receivers" into a man's brain through a process of sexual attraction, according to declassified government documents.

The allegations, sent to the Ministry of Defence, describe how aliens experimented on the man for more than 18 months, injecting him and attempting to control his thoughts with "transmitters".

In a hand-written letter, sent to the in 1995, the Dartford man wrote: "The commonest method of implanting these conductors is by sexual attraction, whether straight or gay, old and young."

The letter is one of dozens of reports declassified by the government and released this month as records of UFO sightings and other extra-terrestrial activity.

The documents, released as part of a three-year project by the and the National Archives, include sightings in Kent between 1994 and 2000.

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