Snowden leaks published by the Guardian were damaging to security, says Nick Clegg

His comments follow those earlier this week from Andrew Parker, the new head of MI5, who launched a scathing attack on the leaks

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The Deputy Prime Minister Nick Clegg has said some of the "technical secrets" disclosed by the former US intelligence operative Edward Snowden and published in the Guardian would be of "immense interest" to terrorists.

Mr Clegg, who was speaking on his weekly radio phone-in on LBC 97.3, said the use of mass surveillance programmes by Britain's intelligence agencies is a totally legitimate area for debate but that "technical information" which may have "passed readers by" could give terrorists an advantage.

His comments follow those earlier this week from Andrew Parker, the new head of MI5, who launched a scathing attack on the leaks and warned that the disclosure of the "reach and limits" of the GCHQ's capabilities was a "gift" to terrorists.

Mr Parker dismissed suggestions that the agencies were trawling through people's private lives for anything that looked interesting as "utter nonsense".

The Guardian has since vowed to publish more leaks from the former US intelligence worker Edward Snowden.

Speaking on his weekly radio phone-in on LBC 97.3, Mr Clegg said that the Guardian leaks were damaging.

"I have got no doubt that there were some parts of what was published which will have passed most readers of the Guardian completely by, because they were very technical, that would have been of immense interest to people who want harm," he said.

But he said the development by the agencies of powerful new communications surveillance techniques raised wider issues of concern.

"I think there is a totally legitimate debate to be had - and my experience speaking to people in the intelligence agencies is they recognise this - about the use of these new, incredibly powerful technologies," he said.

"We have regulations that were designed for an age which is quite different now. Both terrorists and states and security agencies now conduct this battle online in a way that was unimaginable just a few years ago.

"What that means for privacy and proportionality, that is a totally legitimate area of debate. How you hold the secret parts of any state to account is an incredibly important issue.

"Secrecy is necessary, of course it is. You must absolutely defend the principle of secrecy for the intelligence agencies, without which they can't keep us safe. But you can only really make secrecy legitimate in the eyes of the public if there is proper form of accountability."

Mr Snowden, who is in Russia, leaked information to the Guardian in May that revealed mass surveillance programmes such as the US National Security Agency (NSA)-run Prism and the GCHQ-operated Tempora.

Additional reporting by the Press Association.