Intelligence papers on a reported UFO sighting known as the "Rendlesham incident" have gone missing, files from the National Archives reveal.

The missing files relate to a report of mysterious lights from US servicemen at RAF Woodbridge in Suffolk in 1980.

The disappearance came to light with the release of 8,000 previously classified documents on UFOs.

Officials found a "huge" gap where defence intelligence files relating to the case should be, the papers show.

Tomorrow evening in Ipswich, Suffolk, John Burroughs and Jim Penniston talk for the first time in Suffolk about there experiences. The event, held at the Woodbridge Community Hall on Tuesday December 28th at 6pm will also see Linda Moulton Howe, Nick Pope and investigator and co-author of "Left At East Gate" Peter Robins.

In December 1980 strange lights were seen by US Air Force personnel posted to the twin bases of RAF Bentwaters & Woodbridge. To this day they have never been explained. On the 30th anniversary, December 28 2010 two key eye-witnesses are back in Suffolk to re-count their stories. Airman 1st Class John Burroughs and SSgt Jim Penniston were 81st Security Police Officers patrolling the East Gate at RAF Woodbridge when they observed what they initially thought was an aircraft coming down in the forest. The rest is history.