BBC: Former South African President Nelson Mandela is "responding positively" to treatment for the recurrence of a lung infection, the presidency says.

A statement said the 94-year-old anti-apartheid leader remained under treatment and observation. Mandela was admitted to hospital just before midnight, the office of President Jacob Zuma said earlier.

He spent 18 days in hospital in December undergoing treatment for a lung infection and gallstones. The presidency has not identified the hospital where Mandela is being treated.

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