Earlier in the day President Jacob Zuma visited Mandela and “assured him of the love and support of all South Africans, young and old, and the whole world”, said presidential spokesperson Mac Maharaj.
“We urge South Africans to continue praying for our beloved Madiba during this period. Our hearts are with the whole family and relatives.”
Mandela, 94, was diagnosed with a lung infection and also underwent gallstone surgery.
He was originally flown to hospital in Pretoria from his Eastern Cape home at Qunu.