The American stock market watchdog SEC has started an investigation into malpractice in the payment of the Nissan administration. The Japanese automaker may not have done enough to prevent tampering and the books do not give any clarity about that.

Nissan which is second biggest car manufacturer in Japan is involved in a long and scandalous story. Its CEO, Carlos Ghosn, was sidelined in November due to the alleged financial misconduct. Ghosn is under investigation in Japan for fraud. Ghosn is under arrest in a Japanese cell.

Nissan confirms that the SEC has requested clarification and the company says it cooperates with the investigation. The supervisor’s investigation is still at an early stage because the shutdown of the government in the United States has caused delays. Nissan is also listed on the New York Stock Exchange.