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President Obama to visit South Africa's 'City of Gold'

28 June 2013 Last updated at 07:22 BST

Komla Dumor reports on what US President Barack Obama is likely to discover in South Africa on his arrival in Johannesburg on Friday.

He is in the country as South Africans hold prayer vigils for the health of their former president, Nelson Mandela, who is in hospital suffering from a lung infection.

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