Thousands of people are gathering at a stadium in Johannesburg for a memorial service for Nelson Mandela. US President Barack Obama, Cuban President Raul Castro and UN Secretary General Ban Ki-moon will address the service, as will four of Mr Mandela's grandchildren. It will be held at the 95,000 capacity FNB stadium and be shown on big screens at three ‘overflow’ stadiums. The former South African president died aged 95 last Thursday. ……
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