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Doctors say Nelson Mandela's condition has become critical

23 June 2013 Last updated at 23:36 BST

Nelson Mandela has become critically ill in hospital, the South African presidency has announced.

President Jacob Zuma said he had visited Mr Mandela and spoken to his wife and medical teams.

Mac Maharaj, Mr Zuma's spokesman, said Mr Mandela's condition had deteriorated over the last 24 hours.

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