Pretoria - Nelson Mandela's condition is "very critical" and "anything is imminent", his daughter Makaziwe Mandela said on Thursday.
"I can reiterate that Tata (father) is very critical, that anything is imminent, but I want to emphasise again that it is only God who knows when the time to go is," she told broadcaster SAfm.
Meanwhile, Sapa reported that Mandela's relatives have left the Pretoria hospital.
Family members broke their usual visit routine and collected flowers laid by members of the public outside the Medi-Clinic Heart Hospital.
Ndileka Mandela, a granddaughter of the anti-apartheid icon, said he was in a critical but stable condition.
Another grandchild, Zoleka Mandela, said it had been a tough time for the family.
"He's stable and we'd like to thank everyone for their support," said Zoleka Mandela.
Ndileka Mandela said the public exposure had not been an easy task to deal with.
"They're [the family] anxious; he's critical but stable. Lots of comfort from the messages of support. It's harder going through this in the public eye," Ndileka Mandela said.