The chief accountant for China National Petroleum Corp has been “taken into custody to assist in an investigation” into high-level corruption, in an apparent widening of a probe into Asia’s largest energy company. Wen Qingshan, the chief accountant at CNPC and chairman of CNPC subsidiary Kunlun Energy, was taken into custody to assist with the investigation in recent days, according to numerous reports from Chinese media. Kunlun’s shares were suspended in Hong Kong on Tuesday and the company released a statement in the afternoon saying Mr Wen had resigned as chairman and executive director of the company with immediate effect due to “personal matters” At least a dozen serving and former top executives of CNPC and PetroChina , its Hong Kong and New York-listed subsidiary, have been detained in recent months as part of a sweeping graft inquiry into the power base of one of China’s most powerful politicians. […]