A picture taken on December 5, 2011 in Nogent-sur-Seine shows a sign reading « proctected area, no tresspassing » on the wires fence of the French nuclear plant after Greenpeace activists managed to sneak into the plant in what they said was a bid to highlight the dangers of atomic energy. France ordered a thorough search of all its nuclear plants after environmental group Greenpeace said its activists were inside sites other than one outside Paris where nine were arrested today. AFP PHOTO /FRANCOIS NASCIMBENI