Some 20,000 people from all over Europe have been gathering since 1 May at Cornusse, near Bourges in the Cher department, for several days of rave partying. The site is a firing range that was used until recently to test the Caesar cannon, which authorities describe as dangerous.
The regional officials cited 'pyrotechnic' risks, linked to the possible presence of unexploded munitions, particularly in the wooded area that is declared off-limits.