Several dozen Greenpeace activists broke into a nuclear plant in southern France early on Monday, unfurling banners against atomic power, the organisation and police said.

The activists snuck into the grounds of the Tricastin plant in the southern Drome region around 5:00 am, Greenpeace and local police said.

They hung banners reading “Tricastin: a nuclear accident” and “Francois Hollande: president of a catastrophe?” in reference to the French leader, according to Isabelle Philippe, a Greenpeace spokeswoman.

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Police confirmed the break-in, but did not give any additional information.

Plant officials were not immediately available for comment.

Activists from the environmental anti-nuclear group have staged several break-ins in French nuclear plants in recent years in an effort to highlight what they say are dangers of atomic power and to expose security problems at the power stations.