Former South African president Nelson Mandela is back in hospital with a recurring lung infection.
The Nobel peace laureate's history of lung problems dates back to when he contracted tuberculosis as a political prisoner under South Africa's apartheid regime.
A government statement says Mr Mandela, 94, was admitted shortly before midnight local time.
The current president, Jacob Zuma, has urged South Africa and the world to "pray for our beloved Madiba", referring to the anti-apartheid hero by his clan name.
Earlier this month Mr Mandela spent a night in hospital following a check-up.
He also spent 18 days in hospital in December undergoing treatment for a lung infection and gallstones.