US spy agencies may require 'additional constraints'

The White House said there may need to be additional constraints placed on America's spy agencies after a series of embarrassing disclosures about the broad scope of US intelligence gathering.

"We recognize there needs to be additional constraints on how we gather and use intelligence," said White House spokesman Jay Carney.

The White House has said its review of US intelligence-gathering procedures will be completed by the end of the year.

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US denies spying on the UN

The United Nations said it has received assurances from the US Government that its communications networks "are not and will not be monitored" by American intelligence agencies.