London, Aug 5 (IANS) A spaceship that was ’20 times the size of a football field’ was spotted hovering over Britain’s Manchester airport nearly 15 years back, says a secret defence ministry file that was released Thursday.

The huge spacecraft was seen by a UFO expert in 1995 and its sketch was sent to the defence ministry, The Sun reported Thursday, citing the secret files.

The UFO was described as oblong with a curved front and a series of small nozzles at the rear.

That’s not the only UFO sighting.

A ‘cigar-shaped’ object was seen over Lancashire in 1977 and a ‘strange, glowing object’ was spotted near RAF Woodbridge, Suffolk, in 1980.

In 1998, a circular ‘space station’ was seen in Gwent, South Wales.

‘A proportion of sightings could not be explained,’ Nick Pope, who worked on the files, was quoted as saying.