Mexican marines stand guard as U.S. officials and Mexican investigators take evidence from the scene where two CIA officers were shot on road near Tres Marias, outside Mexico City

 
Mexican marines stand guard as U.S. officials and Mexican investigators take evidence from the scene where two CIA officers were shot on road near Tres Marias, outside Mexico City
Mexican marines stand guard as U.S. officials and Mexican investigators take evidence from the scene where two CIA officers were shot on road near Tres Marias, outside Mexico City August 29, 2012. REUTERS/Henry Romero