The diesel-cheating affair that toppled Volkswagen AG’s chief executive officer deepened as Germany announced plans to widen its investigation and the scandal threatened to ensnare rival BMW AG. BMW plunged as much as 9.7 percent after a German magazine reported Thursday that a diesel version of the X3 sport utility vehicle emitted as much as 11 times the European limit for air pollution in a road test. The entire auto industry and the methods used for testing vehicles are coming under scrutiny following revelations that VW’s “clean diesel” cars have software intended to defeat emissions tests. --Naomi Kresge and Tony Czuczka, Bloomberg, 24 September 2015