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Last Updated: Thursday February 18 2010 07:46 GMT

Thousands of UFO sightings

National Archives handout image of a drawing and description of a UFO sighting from a flight out of Heathrow, one of the previously top-secret files released by the Ministry of Defence (MoD) today

Thousands of UFOs have been spotted around the UK over the past 20 years, according to newly released reports.

There are more than 6,000 pages of the reports, describing people's strange sightings and eerie experiences with extra-terrestrial activity.

The reports include photographs, drawings and film footage of unidentified flying objects.

One of the sightings was over Premier League football club Chelsea's home ground at Stamford Bridge!

Police were told by one man that he was sick and developed a skin condition after a 'tube of light' covered his car.

Different shapes

National Archives handout image of a drawing and description of a UFO sighting over Knutsford, Cheshire, one of the previously top-secret files released by the Ministry of Defence (MoD) today
Lots of sightings have been sketched afterwards like this one

Loads of the UFOs described in more recent reports show the aircraft as big, black and triangular, with lights along the edges.

Back in the 1940s and '50s, most were disc-shaped, which is why they've come to be known as flying saucers.

Some experts reckon the reason they change shape through the ages is just because of what we watch on TV and in the cinema.

UFO writer Dr David Clarke said: "The latest advances in technology may be influencing what people see in the sky."