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Mr. Graybeal said a new review of this year’s data showed that the 10 fatal attacks resulted in the deaths of 19 ISAF service members. His office previously had said the death total was 18.

Most of those killed this year have been Americans, but France, Britain and other coalition member countries also have suffered fatalities.

Mr. Graybeal said each attack in 2011 and 2012 was “an isolated incident and has its own underlying circumstances and motives.”

But last May, an unclassified internal ISAF study, called “A Crisis of Trust and Cultural Incompatibility,” concluded: “Such fratricide-murder incidents are no longer isolated; they reflect a growing systemic threat.”

It said many attacks stemmed from Afghan grievances related to cultural and other conflicts with U.S. troops.