Nelson Mandela remains in critical condition in hospital, South African president Jacob Zuma said on Monday, stressing doctors were doing their best to make him comfortable.
"Former president Mandela remains in a critical condition in hospital. The doctors are doing everything possible to
ensure his well being and comfort," Zuma said.
The frail 94-year-old was admitted to hospital over two weeks ago, in the early hours of June 8, for treatment for a lung infection.
But after intensive treatment at Pretoria's Mediclinic Heart Hospital and some signs of improvement, his condition deteriorated.
President Jacob Zuma visited Mandela on Sunday evening too and was told by doctors "that the former president's condition had become critical over the past 24 hours."
Mandela, who became South Africa's first black president in 1994, is due to celebrate his 95th birthday on July 18.
He has been hospitalised four times since December, mostly for the pulmonary condition that has plagued him since his time in an apartheid jail.
Zuma sought to assure the country that medics were now doing all they could to save his life.
"The doctors are doing everything possible to get his condition to improve and are ensuring that Madiba is well-looked after and is comfortable. He is in good hands," Zuma said, using the revered leader's clan name.
Flowers, cards, balloons and messages of support were left outside the gate of Mandela's Pretoria hospital.
"Two weeks in hospital is really a long time for an old man. I'm worried, we are all worried," said Mthandeni Mjwara in Mthatha, a rural town in the region where Mandela grew up.
"It's quite sad to hear that his health is not improving, I was really hoping for good news."
In Washington, the White House said its thoughts and prayers were with Mandela, as US President Barack Obama prepares to visit South Africa.
"We have seen the latest reports from the South African government that former president Mandela is in critical condition," National Security Council spokeswoman Caitlin Hayden said.
"Our thoughts and prayers are with him, his family and the people of South Africa."
Obama leaves on Wednesday on a tour of Africa that will take him to Senegal, South Africa and Tanzania.
The possibility of a meeting between the first black presidents of both South Africa and the United States has been hotly anticipated for years. The White House has said it will defer to Mandela's family regarding any meeting.
As much as Mandela is loved by South Africans, with the latest hospitalisations many have come to terms with their hero's fragility.
"It is not up to us to decide what happens now. There is nothing we can do," said Aphiwe Ngesi a teacher in Mthatha.
"All we can do is hope for the best."
Many South Africans have instead begun to look anew at his achievements
During 27 years in jail he became the figurehead of the anti-apartheid movement. On his release he negotiated an end to white rule and won the country's first fully democratic elections.
As president he guided the country away from internecine racial and tribal violence.
The South African government has also been criticised amid revelations that the military ambulance that carried Mandela to hospital developed engine trouble, resulting in a 40-minute delay until a replacement ambulance arrived.
The presidency said that Mandela suffered no harm during the wait for another ambulance to take him from his Johannesburg home to a specialist heart clinic in Pretoria 55 kilometres (30 miles) away.
"There were seven doctors in the convoy who were in full control of the situation throughout the period. He had expert medical care," said Zuma.
The doctors also dismissed the media reports that Madiba suffered cardiac arrest (the day he was taken to hospital).
"There is no truth at all in that report," Zuma said on Sunday.
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