Former South African president Nelson Mandela has been admitted to hospital for what the country's government says was a scheduled medical checkup.
A spokesman for President Jacob Zuma said the routine test was to manage a pre-existing condition consistent with Mr Mandela's age.
The statement did not reveal any more details about the condition of the 94-year-old anti-apartheid leader, other than to say he was in a hospital in the capital, Pretoria.
Nelson Mandela underwent treatment in hospital last year for a lung infection and gallstones.
The three-week stay was his longest period in hospital since his release from prison in 1990.
The Nobel Peace Prize laureate has a history of lung problems dating back to when he contracted tuberculosis as a political prisoner. He spent 27 years in prison, including 18 years on the windswept Robben Island off Cape Town.