Glenn Greenwald's comments on it are worth reading.

Western journalists claim that the big lesson they learned from their key role in selling the Iraq War to the public is that it’s hideous, corrupt and often dangerous journalism to give anonymity to government officials to let them propagandize the public, then uncritically accept those anonymously voiced claims as Truth. But they’ve learned no such lesson. That tactic continues to be the staple of how major US and British media outlets “report,” especially in the national security area. And journalists who read such reports continue to treat self-serving decrees by unnamed, unseen officials – laundered through their media – as gospel, no matter how dubious are the claims or factually false is the reporting.

We now have one of the purest examples of this dynamic. Last night, the Murdoch-owned Sunday Times published their lead front-page Sunday article, headlined “British Spies Betrayed to Russians and Chinese.” Just as the conventional media narrative was shifting to pro-Snowden sentiment in the wake of a key court ruling and a new surveillance law, the article claims in the first paragraph that these two adversaries “have cracked the top-secret cache of files stolen by the fugitive US whistleblower Edward Snowden, forcing MI6 to pull agents out of live operations in hostile countries, according to senior officials in Downing Street, the Home Office and the security services.”