The company conducted a full safety review following an incident in San Francisco where a pedestrian was struck and dragged by one of its cars. GM has already halted service nationwide and removed its cars from public roads.

CEO Kyle Vogt and co-founder Dan Kan both resigned in recent weeks and Cruise is preparing for a round of layoffs this month.

The company said that following an initial analysis of the October 2 incident and Cruise's response to it, nine individuals departed Cruise.

“We are committed to full transparency and are focused on rebuilding trust and operating with the highest standards regarding safety, integrity, and accountability. As a result, we believe new leadership is necessary to achieve these goals," the company said.

The Cruise spokesperson confirmed that among those dismissed were also Chief Legal and Policy Officer Jeff Bleich and Senior Vice President of Government Affairs David Estrada.

Cruise's troubles are also a setback for an industry dependent on public trust and the cooperation of regulators. In recent months, the unit had touted ambitious plans to expand to more cities, offering fully autonomous taxi rides.

The investigation, led by law firm Quinn Emmanuel, is expected to last until January, GM has said.

"The personnel decisions made today are a necessary step for Cruise to move forward as it focuses on accountability, trust and transparency," GM said in a statement.