Environmental activists of Greenpeace have broken into a French nuclear power station, to highlight the « vulnerability » of atomic sites in France.

Greenpeace campaigners entered the site at Nogent-sur-Seine, 60 miles (95km) south-east of Paris, before dawn. The activists climbed on top of a reactor building and unfurled a banner, said a Greenpeace spokesman.

The activists « were immediately detected by the security system and were permanently followed on the site, without a decision being made to make use of force, » said an EDF statement.
Please, take a look at the video after, and define « immediately ». I’m not sure I get that word.