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NSA chief: surveillance has stopped dozens of potential attacks


WASHINGTON (Reuters) - The director of the National Security Agency said on Wednesday that recently disclosed top-secret U.S. surveillance programs have helped to prevent "dozens" of potential terrorist events.

NSA chief General Keith Alexander made the comments at a Senate hearing when asked if the intelligence community could estimate how much the agency's broad monitoring of phone call and Internet data had helped prevent a terror attack.

(Reporting by Deborah Charles; Editing by Sandra Maler)