Following the recent terrorist attacks, the French authorities have introduced increased-vigilance measures ("Vigipirate renforcé") as part of their prevention of terrorism campaign and have expressed the wish to extend these measures to the French part of the CERN site.

The Organization has acceded to this request with the understanding that its international status will be respectd and has granted the French Gendarmerie right of access to the Prévessin site and to the LEP/LHC sites on French territory.