Former South African President Nelson Mandela has been admitted to a hospital in Pretoria.

A statement from President Jacob Zuma's office says the 94-year-old former leader was admitted on Saturday, for tests “consistent with his age.” The statement says there is “no cause for alarm.”

Mr. Mandela has grown frail and has not made a public appearance in several years.

In February, he was briefly hospitalized for abdominal pain.

Mr. Mandela became South Africa's first black president in 1994. Prior to becoming president, he spent several decades in prison for his fight against apartheid.