A public bus crashed Thursday down a scrub-covered bank into a sports club building at a school in Arnsberg, in western Germany, injuring 13 people, dpa quoted police as saying. There was no immediate explanation as to why the bus veered off the road in the early morning incident. Its driver and all of its 12 passengers were hurt. A rescue helicopter took the two most seriously injured victims to a local hospital in Arnsberg, 100 kilometres north-east of Cologne.