South Africa's presidency says Nelson Mandela has spent a night in the hospital after he was admitted for tests.

Presidential spokesman Mac Maharaj said Sunday there were no updates on 94-year-old Mandela's condition since he went to a hospital in Pretoria on Saturday afternoon.

In a statement Saturday, Maharaj said the medical tests for the anti-apartheid leader and former president were scheduled and that doctors have indicated there is no cause for "alarm."

Mandela was hospitalized for nearly three weeks in December before going home on Dec. 26. At that time, he was treated for a lung infection and had a surgical procedure to remove gallstones.