BERLIN (Reuters) -Four people were killed and 30 injured when a busy regional train derailed near a popular ski resort and hiking destination in southern Germany on Friday, police said. Fifteen of the injured were receiving hospital treatment, a police spokesperson said, adding that 60 people had been on board at the time of the crash, which occurred north of Garmisch-Partenkirchen in Bavaria. Prosecutors and police have launched an investigation into the cause of the accident, the official said. No information was given on the indentities of the dead or whether the driver was among the casual…