Emails from the BBC, Reuters, the Guardian, the New York Times, Le Monde, the Sun, NBC and the Washington Post were saved by GCHQ and shared on the agency’s intranet as part of a test exercise by the signals intelligence agency.
The disclosure comes as the British government faces intense pressure to protect the confidential communications of reporters, MPs and lawyers from snooping.
The journalists’ communications were among 70,000 emails harvested in the space of less than 10 minutes on one day in November 2008 by one of GCHQ’s numerous taps on the fibre-optic cables that make up the backbone of the internet.