The statement said Sata left last night accompanied by his wife and members of his family but gave no further details.
Concern about 77-year-old Sata’s health has been mounting in Africa’s second largest copper producer since June, when he disappeared from the public eye for a period without explanation and was then reported to be getting medical treatment in Israel.
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Sata missed his scheduled speech at the UN General Assembly in September amid reports that he had fallen ill in New York. But a few days before that he had attended the opening of his country’s parliament where he joked “I am not dead”.