FILE - In this Aug. 24, 2012 file photo, Mexican military personnel check a vehicle in which two United States government employees were shot on the highway leading to the city of Cuern

 

              FILE - In this Aug. 24, 2012 file photo, Mexican military personnel check a vehicle in which two United States government employees were shot on the highway leading to the city of Cuern
FILE - In this Aug. 24, 2012 file photo, Mexican military personnel check a vehicle in which two United States government employees were shot on the highway leading to the city of Cuernavaca, near Tres Marias, Mexico. Mexican federal police who ambushed a U.S. Embassy vehicle, wounding two CIA officers, were not investigating a kidnapping in the area, the attorney general's office said Sunday, Nov. 18, 2012, contradicting the official police explanation of the shooting. (AP Photo/Alexandre Meneghini, File)