Zuma: Mandela remains 'critical but stable'

South Africa's president Zuma has visited Nelson Mandela in hospital this afternoon. He said the former president remains "critical but stable."

Mandela has been treated in a Pretoria hospital for a lung infection for nearly four weeks.

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Mandela 'responds to treatment'

Former South African President Nelson Mandela is "responding to treatment", according to an official statement tonight, but is still in a critical condition in hospital.