Journalist: All encrypted data is 'impossible to access'

Guardian journalist Glenn Greenwald has told ITV News "even the most advanced intelligence services" would find it "impossible" to access information that he and his partner carry across the world because it is too well encrypted.

In his first British TV interview, Mr Greenwald refused to confirm what data his boyfriend David Miranda had confiscated by police when he was detained for nine hours at Heathrow Airport on Sunday as he headed back to Brazil.

Watch: Guardian journalist 'angry' at partner's detention

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Miranda's detention reviewed

The independent reviewer of anti-terror laws has told the Home Secretary he is reviewing the detention of David Miranda for nine hours at Heathrow . The Met police has launched a criminal inquiry after seizing data his electronic devices