China’s securities regulator on Friday said it is investigating the impact of automated trading on the market, as Beijing intensifies pressure on its financial industry in the wake of a share-price plunge. The China Securities Regulatory Commission (CSRC), in an announcement on its official microblog, also said it had restricted 24 stock trading accounts for suspected irregularities, including abnormal bids for shares and bid cancellations that might have impacted wider market performance.