Thursday, the first injury accident was reported by Google when its modified Lexus SUV was rear-ended in Mountain View, California.

Google's self-driving cars have logged almost 2 million miles of test driving without reporting an injury. Fox News reports the company recently started reporting all accidents that occur with its vehicles to the public. This is the first one where someone was reported as injured.

The Google Lexus SUV was carrying three passengers when it was rear-ended by another driver. The three Google employees complained of minor whiplash and the driver in the other car also had back and neck pains. The accident occurred on July 1 and the employees were checked out at a hospital before they returned to work.

California requires that a person be behind the wheel of a self-driving car to take over in the event of an emergency. Google also sends another employee along to sit in the front passenger seat to record data on a laptop computer. In this situation, there was also a third passenger.

Google is working to make these self-driving cars safe and efficient. The company believes these cars will be even more efficient and safer than human-driven cars.

In six years, Google has reported 14 accidents during testing. Google says that all of the accidents have not been their fault and that they are usually the result of distracted drivers.

Of the 14 accidents, 11 involved the Google car being rear-ended.

In a blog post Thursday, the head of Google's self-driving program Chris Urmson said that the Google SUVs "are being hit surprisingly often." He believes it is due to drivers being distracted by their mobile phones.

"The clear theme is human error and inattention," Urmson wrote. "We'll take all this as a signal that we're starting to compare favorably with human drivers."

The crash that caused the injury on July 1 involved a vehicle hitting the Google SUV at about 17 mph. No accident report was filed by Mountain View Police.

According to CNN, the vehicle that hit the Google SUV had its bumper fall off.