Federal safety regulators tasked with investigating Alphabet’s Waymo have discovered nine additional incidents that bring the safety of the self-driving vehicles into question.The National Highway Traffic Safety Administration Office of Defects Investigation (ODI) opened an investigation into Waymo earlier this month after receiving 22 reports of the self-driving taxis making moves that led to crashers or violated safety laws,

The NHTSA has announced its investigation into Alphabet's Waymo self-driving vehicles following a series of concerning incidents.

Several incidents in the Phoenix metro were highlighted in the federal agency's latest documentation related to the Waymo investigation.

Federal safety regulators have discovered nine more incidents that raise questions about the safety of Waymo’s self-driving vehicles operating in Phoenix and San Francisco. The National Highway Traffic Safety Administration Office of Defects Investigation (ODI) opened an investigation earlier this month into Waymo’s autonomous vehicle software after receiving 22 reports of robotaxis making unexpected moves that led to crashes and potentially violated traffic safety laws.

The top US auto-safety regulator expanded its investigation into Waymo, the autonomous-vehicle subsidiary of Alphabet Inc., after more incidents were identified in which the company’s cars were involved in collisions or may have violated traffic laws.

Just a little over a week after U.S. auto-safety regulators began investigating Google’s Waymo, several additional incidents have surfaced in which the self-driving “robotaxis” may have violated traffic-safety laws or caused an collision.

The U.S. National Highway Traffic Safety Administration (NHTSA) learned of nine additional incidents, raising concerns about the state of performance of Alphabet's Waymo (NASDAQ:GOOG) self-driving vehicles,