'Defence officials issued a confidential D notice to the BBC and other media groups in an attempt to censor coverage of surveillance tactics employed by intelligence agencies in the UK and US.
Editors were asked not to publish information that may "jeopardise both national security and possibly UK personnel" in the warning issued on 7 June, a day after the Guardian first revealed details of the National Security Agency's (NSA) secret Prism programme.'
Read more: MoD serves news outlets with D notice over surveillance leaks
