The National Archives has today released its tenth and final tranche of UFO files, containing 4,400 pages of UFO policy, correspondence and UFO sighting reports covering the final two years of the Ministry of Defence's UFO Desk (from late 2007 until November 2009).

The files reveal for the first time the reasons behind the closure of the UFO Desk and how sightings had become a social phenomenon making tabloid headlines and sparking a disclosure campaign for 'the truth'.

Dr David Clarke, author of the book 'The UFO Files', said: 'The last pieces of the puzzle have finally been revealed with this insight into the last days of the UFO Desk. These files spell out clearly why the Ministry of Defence decided - after 60 years - it no longer needed to keep tabs on sightings, even those made by 'credible' people such as police officers and pilots. The last files from the UFO desk are now all in the public domain. People at home can read them and draw their own conclusions about whether 'the truth' is in these files or still out there.'

To read more, click here.