Cabinet Secretary Sir Jeremy Heywood was directed by the Prime Minister to contact the Guardian about the classified material handed over by Edward Snowden, it has been reported.
The intention was to spell out the serious consequences of continuing to publish material about UK and US intelligence operations, the Independent said.
Earlier, Guardian editor Alan Rusbridger revealed his newspaper had destroyed a hard drive containing a copy of the secret documents under the supervision of GCHQ officers following sustained pressure from Government.
The independent reviewer of terrorism legislation said he will examine the detention of David Miranda at Heathrow Airport.
Nick Clegg has backed David Cameron's decision to send a top civil servant to The Guardian to urge them to destroy classified data.
The Guardian journalist whose partner was held at Heathrow Airport hits out at the UK as he gives ITV News his first British TV interview.