A statement on the South African presidency website explains that Mandela's home in Johannesburg has been adapted ahead of his return.
It reads: "His home has been reconfigured to allow him to receive intensive care there. The health care personnel providing care at his home are the very same who provided care to him in hospital.
"If there are health conditions that warrant another admission to hospital in future, this will be done."
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Michael Fallon has received reassurances from his US counterpart that security ties with Britain will "endure" following a vote for Brexit.
On Friday, police said it appeared the girl had shot herself in the face with the weapon.
The showers will be slow-moving, heavy and thundery at times, particularly in central and eastern areas.