Sillon de Bretagne is a skyscraper in Saint-Herblain, a suburb of Nantes, in the Loire-Atlantique department of France. At 32-storeys, 97 m it was the tallest building in France when completed in 1969. From Wikipedia
A disparition inquiétante inquiry is underway with authorities reviewing phone geolocations after the teenagers were last spotted at a Saint-Sébastien-sur-Loire bowling alley.