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Photo by: Raymundo Ruiz

** FILE ** El Paso police officers lookout into the Mexican border city of Ciudad Juarez after a heavy gun battle erupted in Ciudad Juarez, Mexico, Saturday, Aug. 21, 2010. At least one gunman was killed and three police officers were injured when gunmen attacked a municipal police patrol on a boulevard in Ciudad Juarez and the fighting escalated when federal police rushed to help. El Paso police closed that city's border highway for about 30 minutes because of the shooting. (AP Photo/Raymundo Ruiz)

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