An investigation into an explosion in the paddock at the Nürburgring motor-racing track in Germany that left 22 people injured is in full swing, authorities told dpa on Saturday. According to initial findings, a compressed air cylinder may have exploded, although the exact cause still needs to be determined. A police spokesman in the western German city of Koblenz told dpa that results of the investigation are not expected until next week. The explosion on Friday occurred between pits 26 and 27 in the paddock during testing for a six-hour race later that evening. A total of 22 people were inju…