Google Inc. revealed Thursday that one of its self-driving car prototypes was involved in an injury accident for the first time. In the collision, a Lexus SUV that the tech giant outfitted with sensors and cameras was rear-ended in Google's home city of Mountain View, where more than 20 prototypes have been self-maneuvering through traffic. The three people on board complained of minor whiplash, were checked out at a hospital and cleared to go back to work following the July 1 collision, Google said. The driver of the other car also complained of neck and back pain. In California, a person must be behind the wheel of a self-driving car being tested on public roads to take control in an emergency. Google typically sends another employee in the front passenger seat to record details of the ride on a laptop. In this case, there was also a back seat passenger. According to an accident report that Google filed with the California Department of Motor Vehicles: Read more http://abcnews.go.com/Technology/wireStory/google-driving-car-involved-injury-accident-32505795