A deputy head of China’s securities regulator is being investigated for suspected “serious breaches of discipline”, the ruling Communist Party’s anti-graft watchdog said on Friday, using the usual euphemism for corruption. The brief statement by the Central Commission for Discipline Inspection gave no further details of the probe into Yao Gang, a vice chairman of the China Securities Regulatory Commission (CSRC). China’s financial regulators have been under heavy pressure since stock markets collapsed in mid-June following a long bull run, though the statement made no mention of the markets.