President Jacob Zuma has called on the nation to pray for Nelson Mandela.
"All of us in the country should accept the fact that Madiba is now old. He is 95 years [sic] and that therefore, as he ages, his health will begin to trouble him".
"What we need to do as a country is to pray for him ... to ensure that the doctors do their work so that he can come out of hospital," he added.
More top news
Photos from an historic day in Scotland's history as voters choose to remain part of the United Kingdom.
Is Manchester really more powerful than Wales and Northern Ireland? Find out how the union's four nations compare with England's regions.
Hollywood director J.J. Abrams has been declared the victor in a good-natured Twitter war with his friend and fellow director Zack Snyder.