Article Photos: Mexico probes why federal cops fired at US gov car



  An armored U.S. Embassy vehicle is checked by military personal after it was attacked by unknown assailants on the highway leading to the city of Cuernavaca, near Tres Marias, Mexico, Friday, Aug. 24, 2012. Two U.S. government employees were shot and wounded in an attack on their vehicle south of Mexico City on Friday, a law enforcement official said. (AP Photo/Alexandre Meneghini)

An armored U.S. Embassy vehicle is checked by military personal after it was attacked by unknown assailants on the highway leading to the city of Cuernavaca, near Tres Marias, Mexico, Friday, Aug. 24, 2012. Two U.S. government employees were shot and wounded in an attack on their vehicle south of Mexico City on Friday, a law enforcement official said. (AP Photo/Alexandre Meneghini)