A Google-operated self-driving car was involved in an accident early in July, in which some people were injured when Google's futuristic vehicle was rear-ended by another vehicle.
Several employees suffered minor whiplash in the July 1 incident, when a vehicle drove into the rear of a Lexus RX450h prototype, which had stopped at a traffic light near the Google headquarters in Mountain View, California, Google said on Friday.
Google said it was the first such incident involving injuries in a self-driving car.
Google said its prototype vehicles have been struck 14 times so far. The Google vehicle was not at fault in any of those incidents, the company said.
Google is testing a fleet of Lexus prototypes, and said it has logged more than 1 million test miles. Last month, the company began testing a smaller self-driving prototype vehicles of its own design on public roads around Mountain View.
The company has also started testing self-driving prototypes in Austin, Texas.