http://www.telegraph.co.uk/news/worldnews/northamerica/usa/10255767...

There were similar fears that the Guardian’s own computer system was not secure enough to be trusted with protecting such highly sensitive information. This was why the Prime Minister “explicitly” sanctioned the operation to destroy computer equipment storing information from the NSA whistleblower, Edward Snowden, at the Guardian’s London offices, the source said. The newspaper’s editor Alan Rusbridger described how he had come under pressure from “shadowy” Whitehall figures to hand over the documents. Eventually two security experts from the government’s listening station, GCHQ, oversaw the destruction of the hard drives, he said. Confirmation of the Prime Minister’s personal involvement in the case risks fuelling claims that the detention of Mr Miranda was politically motivated.