Mexican federal police shot and wounded two CIA operatives last week, security sources said, in an apparently deliberate attack that could hurt U.S.-Mexico cooperation in their war against drug cartels.

The two experienced officers were just south of the capital on their way to a Mexican Marine base on Friday, working with local authorities on a training mission, when federal police riddled their armored van bearing diplomatic plates with bullets.

http://www.reuters.com/article/2012/08/30/us-mexico-shooting-idUSBRE87S19K20120830