PARIS - French security officials are investigating a spate of mysterious and illegal flights by drone aircraft over more than a dozen nuclear power stations in France, raising security concerns in a country that largely lives off atomic energy.
In what environmental activists call a worrisome development, authorities have tallied at least 15 overflights of nuclear sites since early October, culminating Friday with five at separate sites, government and utility officials said Monday.
Authorities insist that France's nuclear facilities are designed to handle seismic and security risks. State-controlled power company EDF - which has had 13 sites flown over by drones - said the overflights have not affected plant operations in any way.
Environment and Energy Minister Segolene Royal told French media on Sunday that investigators have no leads about who was behind the flights.