Obama in South Africa
US President Barack Obama has landed in South Africa, the second stop in his three-country tour of Africa.
Obama said earlier he did not expect to see former President Nelson Mandela, who is critically ill in hospital.
Mandela's ex-wife, Winnie Mandela said the former leader had made great improvement in recent days, but was still unwell.
However, she said she felt it would not be right for the US president to visit Mandela while he was in a critical condition.
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