what are the possible causes of a no crank/no start and no power?

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car was sitting idle for about 15min at a shell station while waiting for a passenger. While backing out of the parking, the car suddenly and quickly shut down. no lights on dash no power to radio ,windows, seats ,door locks , seat belts nor beeps to indicate the key in the ignition. The only equipment recieving power is :h/lights,t/tail lights, horn and door ajar light on all doors;its as if the car is not recognizing the key. The key enters the ignition with ease and cycles through every position with no binding.