04/07/2015 05:08 pm ET Updated Apr 07, 2015

U.S. Secretly Tracked Billions Of Calls For Decades: Report

MANDEL NGAN via Getty Images

WASHINGTON — The U.S. government started keeping secret records of Americans' international telephone calls nearly a decade before the Sept. 11 terrorist attacks, harvesting billions of calls in a program that provided a blueprint for the far broader National Security Agency surveillance that followed.

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