South Korean stock market regulators have launched an investigation into potential irregular trades by Deutsche Bank’s brokerage unit.
The probe comes after the bourse in Seoul fell by almost three percent in the last few minutes of trading on Thursday.
Foreign investors dumped a record number of shares, worth around 1.4 billion euros.
Deutsche Bank declined to comment.
The bank was a top seller of shares of major companies, including Samsung Electronics, steelmaker POSCO, carmaker Hyundai and KB Financial Group on Thursday, according to information from the Korea Exchange.