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The South African president’s office says Nelson Mandela has left the hospital and has returned home after spending a night for tests.

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.