Defense Department: 24,000 Pentagon Files Stolen In March Cyberattack

24,000 Pentagon Files Stolen In Massive Cyberattack

The Defense Department lost 24,000 files to "foreign intruders" in the spring in what appears to be one of the most damaging cyberattacks to date on the U.S. military, a top Pentagon official acknowledged Thursday.

Deputy Defense Secretary William J. Lynn III, who disclosed the March breach during a speech to roll out the Pentagon's new cyber strategy, said the files were taken from a defense contractor. He did not say who was believed to be behind the attack or describe the nature of the files that were stolen.

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