Nelson Mandela, South Africa’s former leader, has been admitted to hospital in the capital Pretoria to undergo tests, officials say.
The office of President Jacob Zuma said 94-year-old Nelson Mandela was doing well and there was “no cause for alarm”.
Nelson Mandela spent more than two decades in jail under the white minority apartheid regime.
He served as South Africa’s first black president between 1994 and 1999, and received the Nobel Peace Prize in 1993.
Nelson Mandela has appeared in public only rarely since 2004, when he retired from public life.
In January 2011 he was treated for a serious chest infection, and a year later underwent a diagnostic procedure for an abdominal problem.