A Navy Marine stands behind tape marking the perimeter around an armored U.S. Embassy vehicle, not in the picture, 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)

Associated Press
A Navy Marine stands behind tape marking the perimeter around an armored U.S. Embassy vehicle, not in the picture, 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)
A Navy Marine stands behind tape marking the perimeter around an armored U.S. Embassy vehicle, not in the picture, 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)
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