Nelson Mandela: Atmosphere builds in FNB stadium

Thousands of people are arriving at the 95,000 capacity FNB stadium in Johannesburg for a memorial service for Nelson Mandela.

US President Barack Obama and the UN Secretary General Ban Ki-moon will be among those paying tribute.

The BBC's George Alagiah and Milton Nkosi are in the stadium, where the atmosphere is building ahead of the event.

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