A Tesla Model 3 head-on collided with a Subaru Impreza in South Lake Tahoe, California, killing the driver of the Subaru and a three-month baby in the Tesla.

The incident prompted the US National Highway Traffic Safety Administration (NHTSA) to announce it would launch a special investigation into the crash over the possible involvement of Tesla’s advanced driver assistance system, Autopilot, which it suspects was engaged at the time.

According to Reuters, the NHTSA has launched over three dozen special investigations into Tesla incidents since 2016. 

The automaker’s advanced driver assistance systems were suspected of being involved in all of them.