Mexican authorities are trying to sort out why a U.S. Embassy vehicle was shot up by federal police on a rural back road in mountains south of the capital, leaving two U.S. government workers wounded. Officials from both nations said the federal officers were chasing criminals Friday morning when a hail of bullets was fired at the embassy sport utility vehicle, but the accounts left many questions unanswered. The two American workers were taken to a hospital in the nearby resort city of Cuernavaca. One had a gunshot wound in his leg and the other was wounded in the stomach...