Back in 2010 spy officials allegedly voiced concerns that so much data was being collected by the UK security services they risked overlooking useful intelligence.
The draft report, thought to be written for the UK government, was obtained by the Intercept website from US whistle-blower, Edward Snowden.
The report suggests that “life-saving intelligence data” could be missed.
Its release comes as the Investigatory Powers bill goes through Parliament.Extracts from the document said: "The security service... can currently collect significantly more than it is able to exploit fully.
"This creates a real risk of intelligence failure from the service being unable to access potentially life-saving intelligence from data that it has already collected."
The report was allegedly prepared by British Spy Agency officials to brief the government’s Cabinet Office and Treasury Department about the UK’s surveillance capabilities.
The capabilities are currently due to be updated by the controversial Investigatory Powers Bill – which is now at the report stage in Parliament.
The government said these added powers were necessary in the first fight against terrorism.Critics of the bill said the alleged leaked document showed mass surveillance was not the answer.
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