The South African president’s office said Saturday that Nelson Mandela remains hospitalized, contradicting earlier reports that he had returned home.

Two sources close to Mandela had told CNN Saturday that he had returned to his Johannesburg home after a long hospital stay.

After similar reports by various media outlets, the president ‘s office issued a statement.

“The presidency has noted incorrect media reports that former President Nelson Mandela has been discharged from hospital,” the statement said. “Madiba is still in hospital in Pretoria, and remains in a critical but stable condition. At times his condition becomes unstable, but he responds to medical interventions.”

Mandela, 95, was hospitalized June 8 because of a lung infection. He marked his July birthday at the Pretoria hospital where he has been surrounded by relatives.