Nidderau (dpa / lhe) – An unknown person threw a cobblestone from a bridge onto a car on the federal highway 45 near Nidderau (Main-Kinzig-Kreis). The 24-year-old driver was unharmed in the incident last Friday (December 23), as the police in Offenbach announced on Wednesday. The stone, weighing around ten kilograms, landed on the hood of the car. The police are investigating dangerous traffic violations and are looking for witnesses.