A senior banking regulator admits that mainland banks may face a daunting bad-loan problem in the long run if most of their loans are granted to certain sectors, such as infrastructure and real estate. Wang Huaqing, the disciplinary secretary of the China Banking Regulatory Commission, told a forum in Beijing yesterday the lending spree to big customers in certain sectors would carry risks for banks for a "long time", according to a Bloomberg report. "Credit growth of this magnitude inevitably places a strain on banks' internal risk management and raises concerns about a future deterioration in loan quality," said Charlene Chu, an analyst at Fitch Ratings