Top stories
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Boundless Informant: the NSA's secret tool to track global surveillance data
Revealed: The NSA's powerful tool for cataloguing data – including figures on US collection
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Nelson Mandela in serious condition in hospital, says South Africa
Wife with former leader as he is treated for recurring lung infection, but he is stable, conscious and can breathe unaided
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Erdoğan's party rules out early elections as thousands defy call to end protest
Tens of thousands of Turks mass again in Taksim Square, where activists have been sleeping in tents and buses
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