Conflicting Reports On Condition Of Former President Nelson Mandela

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South Africa officials won't confirm media reports that former President Nelson Mandela is on life support systems.
    
President Jacob Zuma visited Mandela Wednesday night and said the 94-year-old is in critical condition and that doctors are doing everything they can.
    
Tributes to Mandela include flowers and hand-written messages left outside the hospital and at his home.