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South Africa celebrates Nelson Mandela's 94th birthday

18 July 2012 Last updated at 19:04 BST

Millions of school children across South Africa have sung a specially composed song as part of official celebrations for Nelson Mandela's 94th birthday on Wednesday.

The former South African president is celebrating with his family in his village home of Qunu in the Eastern Cape, near where he was born.

George Alagiah reports.