'Dozens of terror plots' stopped by US spy programmes

General Keith Alexander giving evidence to the US Senate committee hearing on cybersecurity

The director of the National Security Agency has told a US senate hearing said that the leaked American surveillance programmes have helped to prevent "dozens" of potential terrorist attacks.

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US spy data 'halted terror plots'

The director of the National Security Agency has told a US senate hearing said that the leaked American surveillance programmes have helped to prevent "dozens" of potential terrorist attacks.