Military guards stand in front of an armored U.S. Embassy vehicle 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)

Associated Press
Military guards stand in front of an armored U.S. Embassy vehicle 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)
Military guards stand in front of an armored U.S. Embassy vehicle 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)
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