One of the largest self-driving trucking companies in the U.S. is trying to stay on the road amid a rush of federal investigations. The Wall Street Journal reports that TuSimple Holdings fired its chief executive and co-founder, Xiaodi Hou, after the board found that the company shared confidential information with a trucking startup with operations mostly in China and funded by Chinese investors. 

Hou’s abrupt dismissal comes as TuSimple is being investigated by the FBI, securities regulators and the Committee on Foreign Investment in the U.S. over whether it improperly financed and transferred technology to Hydron. 

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TuSimple has faced questions about ties to China before, but the latest actions raise the stakes for a publicly traded business that has claimed big advances in automation technology. 

Hou’s dismissal follows months of upheaval at TuSimple, including the departures of its chief financial officer and chief legal officer.