Uber has announced it's suspending self-driving car testing after one of its vehicles was involved in a crash in Arizona.No one was injured in the accident, but photos from the scene show the self-driving Volvo SUV on its side and significant damage to one of the other cars.The Uber vehicle was not responsible for the incident and there were no injuries, Tempe police information officer Josie Montenegro told Bloomberg News.  Another car failed to yield for the Uber car, causing the autonomous vehicle to flip on its side, according to the police report."There was a person behind the [Uber] wheel," Montenegro is quoted as saying. "It is uncertain at this time if they were controlling the vehicle at the time of the collision."An Uber spokeswoman said, "We are continuing to look into this incident and can confirm we had no backseat passengers in the vehicle."Update - trials restarted on Monday afternoon.(Picture credit - @Fresconews on Twitter)