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Parishioners hold a candle light vigil for Nelson Mandela outside the Mediclinic Heart Hospital in Pretoria where the ailing former South Africa's president Nelson Mandela is hospitalised on June 28, 2013. Mandela, who turns 95 next month, was rushed to hospital three weeks ago with a recurrent lung disease. MARCO LONGARI/AFP/Getty Images ( 520974448 )

PRETORIA, SOUTH AFRICA - JUNE 28: U.S. President Barack Obama (L) and first lady Michelle Obama (C) are greeted by Minister of International Relations and Cooperation Maite Mkoana-Mashabne after arriving at Waterkloof Air Force Base June 28, 2013 in Pretoria, South Africa. This is Obama's first official visit to South Africa, where is schedule to hold bilaterial meetings with President Jacob Zuma, host a town hall meeting with students in Soweto Township and visit Robben Island, where former President Nelson Mandela spent some of his 27 years in prison for fighting against apartheid. (Photo by Chip Somodevilla/Getty Images) ( 171766633 )

PRETORIA, SOUTH AFRICA - JUNE 28: A man looks at tributes as well-wishers continue to gather outside the Mediclinic Heart Hospital where Nelson Mandela is being treated on June 28, 2013 in Pretoria, South Africa. People continue to gather and lay flowers and tributes outside the Mediclinic Heart Hospital where Mandela is being treated for a lung infection on his 21st day in hospital. (Photo by Christopher Furlong/Getty Images) ( 171750819 )

A vendor wearing a shawl bearing the image of former South African President Nelson Mandela at the entrance to the Mediclinic Heart Hospital where Nelson Mandela is being treated in Pretoria, South Africa Friday, June 28, 2013. Members of Nelson Mandela's family as well as South African Cabinet ministers have visited the hospital on Friday where the 94-year-old former president is critically ill. (AP Photo/Muhammed Muheisen) ( South Africa Mandela )

The former wife of Nelson Mandela, Winnie Mandela Madikizela, and their daughter Zindzi (L) leave the hospital where the former South African President is hospitalized on June 28, 2013 in Pretoria. The ex-wife of ailing Nelson Mandela on Friday said that the anti-apartheid icon's condition had improved in recent days, but he was still "unwell." ERIC FEFERBERG/AFP/Getty Images ( 520973094 )

Winnie Madikizela-Mandela arrives for a press statement in front of the house of her former husband and former South African President Nelson Mandela in Soweto, Friday, June 28, 2013. Members of Nelson Mandela's family as well as South African Cabinet ministers have visited the hospital where the 94-year-old former president is critically ill. (AP Photo/Markus Schreiber) ( South Africa Mandela )

Two-year-old Precious Mali holds a picture of former South African President Nelson Mandela as well-wishers gather outside the Medi-Clinic Heart Hospital where Mandela is being treated in Pretoria June 28, 2013. REUTERS/Dylan Martinez ( MANDELA/ )

People walk past a mural in Alexandra township on June 28, 2013. US President Barack Obama arrived in South Africa on Friday to pay homage to his hero Nelson Mandela, who was said to be showing "great improvement" in hospital. ALEXANDER JOE/AFP/Getty Images ( 520973400 )

An ANC Youth League supporter, at a vigil outside former South African President Nelson Mandela's house in the Soweto township, on the outskirt of Johannesburg, Thursday June 27, 2013. Nelson Mandela's health improved overnight and his condition remains critical but is now stable, the South African government said Thursday in a statement that brought a measure of relief to the country. (AP Photo/Jerome Delay) ( South Africa Mandela )

Sunrays illuminate Qunu, the village where former South African President Nelson Mandela grew up, on June 27, 2013. South African President Jacob Zuma said on June 27 that the condition of ailing anti-apartheid hero Nelson Mandela had improved overnight, but he remains critical but stable. CARL DE SOUZA/AFP/Getty Images ( 520933958 )

CAPE TOWN, SOUTH AFRICA - JUNE 27: A person walk past a display at the Cape Town Honours Nelson Mandela exhibition at the Cape Town Civic Centre as part of the Cape Town Honours Nelson Mandela exhibition on June 27, 2013 in Cape Town, South Africa. South African President Jacob Zuma confirmed on June 23 that Mandela's condition has become critical since he was admitted to the hospital over two weeks ago for a recurring lung infection. Photo by Michelly Rall/Getty Images) ( 171659591 )

JOHANNESBURG, SOUTH AFRICA - JUNE 27: Media gather in Soweto Vilakazi Street as they await news of former South African President Nelson Mandela in Vilakazi Street on June 27, 2013 in Johannesburg, South Africa. South African President Jacob Zuma confirmed on June 23 that Mandela's condition has become critical since he was admitted to the hospital over two weeks ago for a recurring lung infection. (Photo by Jeff J Mitchell/Getty Images) ( 171649500 )

PRETORIA, SOUTH AFRICA - JUNE 27: The sun sets over the Heart Hospital where Mandela is being treated for a lung infection June 27, 2013 in Pretoria, South Africa. Family members and President Jacob Zuma visited Mandela during his 20th day in the hospital. (Photo by Dan Kitwood/Getty Images) ( 171643985 )

PRETORIA, SOUTH AFRICA - JUNE 27: Supporters of former South African President Nelson Mandela gather as they wait to hear news of his condition outside the Heart Hospital where Mandela is being treated for a lung infection June 27, 2013 in Pretoria, South Africa. Family members and President Jacob Zuma visited Mandela during his 20th day in the hospital. (Photo by Dan Kitwood/Getty Images) ( 171643951 )

A woman holding an ANC party flag takes part in a gathering to support of former South African President Nelson Mandela outside the Medi Clinic Heart hospital in Pretoria on June 27, 2013. Nelson Mandela remained in critical condition today despite tentative signs of improvement, as US President led a chorus of support for the "hero for the world." South African President, who abruptly cancelled a trip abroad to be near the 94-year-old anti-apartheid hero, reported that he "remains critical but is now stable." FILIPPO MONTEFORTE/AFP/Getty Images ( 520928613 )

PRETORIA, SOUTH AFRICA - JUNE 27: Residents of a nearby tower block stand on the roof looking over the Heart Hospital where Mandela is being treated for a lung infection June 27, 2013 in Pretoria, South Africa. Family members and President Jacob Zuma visited Mandela during his 20th day in the hospital. (Photo by Dan Kitwood/Getty Images) ( 171635997 )

People sing and dance in front of the Medi Clinic Heart hospital in Pretoria on June 27, 2013. Emotional crowds gathered outside the hospital where Nelson Mandela showed tentative signs of improvement on June 27. FILIPPO MONTEFORTE/AFP/Getty Images ( 520933919 )

JOHANNESBURG, SOUTH AFRICA - JUNE 27: ANC supporters hold a candlelit vigil outside the former home of former South African President Nelson Mandela in Soweto township on June 27, 2013 in Johannesburg, South Africa. South African President Jacob Zuma confirmed on June 23 that Mandela's condition has become critical since he was admitted to the hospital over two weeks ago for a recurring lung infection. (Photo by Jeff J Mitchell/Getty Images) ( 171641742 )

A group of well-wishers hold candles and a photo of Nelson Mandela as they pray for his recovery outside the Mediclinic heart hospital where he is hospitalized in Pretoria on June 27, 2013. A critically ill Nelson Mandela showed tentative signs of improvement on June 27 as South Africa-bound US President Barack Obama led a chorus of support for the "hero for the world". South African President Jacob Zuma, who had abruptly cancelled a trip abroad to be near the 94-year-old anti-apartheid icon, reported he "remains critical but is now stable". ALEXANDER JOE/AFP/Getty Images ( 520938045 )

A group of well wishers hold candles as they pray for the recovery of Nelson Mandela outside the Mediclinic heart hospital in Pretoria on June 26, 2013. Mandela is receiving treatment at the Mediclinic heart hospital in Pretoria. Mandela's close family gathered yesterday at his rural homestead to discuss the failing health of the South African anti-apartheid icon who was fighting for his life in hospital. Messages of support poured in from around the world for the Nobel Peace Prize winner, who spent 27 years behind bars for his struggle under white minority rule and went on to become South Africa's first black president. ODD ANDERSEN/AFP/Getty Images ( 520903679 )

A group of well wishers hold candles as they pray for the recovery of Nelson Mandela outside the Mediclinic heart hospital in Pretoria on June 26, 2013. Mandela is receiving treatment at the Mediclinic heart hospital in Pretoria. Mandela's close family gathered yesterday at his rural homestead to discuss the failing health of the South African anti-apartheid icon who was fighting for his life in hospital. Messages of support poured in from around the world for the Nobel Peace Prize winner, who spent 27 years behind bars for his struggle under white minority rule and went on to become South Africa's first black president. ODD ANDERSEN/AFP/Getty Images ( 520903987 )

A well wisher wears a badge with a picture of Nelson Mandela outside the Mediclinic heart hospital in Pretoria on June 26, 2013. Mandela is receiving treatment at the Mediclinic heart hospital in Pretoria. Mandela's close family gathered yesterday at his rural homestead to discuss the failing health of the South African anti-apartheid icon who was fighting for his life in hospital. Messages of support poured in from around the world for the Nobel Peace Prize winner, who spent 27 years behind bars for his struggle under white minority rule and went on to become South Africa's first black president. ODD ANDERSEN/AFP/Getty Images ( 520904135 )

People stand near portraits of Nelson Mandela and messages left for him outside the Medi Clinic Heart hospital in Pretoria on June 26, 2013. Emotional crowds gathered outside the hospital where Nelson Mandela lay in critical condition on June 26, 2013, as relatives and clan elders made preparations for the revered former South African leader's final journey. Singing supporters amassed outside the Pretoria hospital where the 94-year-old anti-apartheid hero was fighting for his life. FILIPPO MONTEFORTE/AFP/Getty Images ( 520900376 )

A shepherd boy is silhouetted on June 26, 2013, in Qunu a rural village where former South African President Nelson Mandela grew up. Mandela's close family members gathered to hear a sombre prayer wishing the anti-apartheid icon a "peaceful, perfect, end" as he lay in hospital in critical condition with his life seemingly slipping away. CARL DE SOUZA/AFP/Getty Images ( 520900175 )

The South African flag flies near Qunu on June 26, 2013. Qunu is the city where former South African President Nelson Mandela grew up. Mandela remains in critical condition in hospital in Pretoria where he is being visited by family members. CARL DE SOUZA/AFP/Getty Images ( 520901548 )

A woman holding her baby is pictured on June 26, 2013 in Qunu, a rural village where former South African President Nelson Mandela grew up. Mandela's close family members gathered to hear a sombre prayer wishing the anti-apartheid icon a "peaceful, perfect, end" as he lay in hospital in critical condition with his life seemingly slipping away. CARL DE SOUZA/AFP/Getty Images ( 520895576 )

South African President Jacob Zuma addresses the 10th annual meeting of the National Education Health & Allied Workers in Johannesburg, Wednesday June 26, 2013. During his speech, Zuma said Nelson Mandela was "still critical" and that we must "pray every minute". (AP Photo/Jerome Delay) ( South Africa Mandela )

PRETORIA, SOUTH AFRICA - JUNE 26: A man holds a picture as people gather to leave messages of support for former South African President Nelson Mandela outside the Mediclinic Heart Hospital June 26, 2013 in Pretoria, South Africa. South African President Jacob Zuma confirmed on June 23 that Mandela's condition has become critical since he was admitted to the hospital over two weeks ago for a recurring lung infection. (Photo by Jeff J Mitchell/Getty Images) ( 171543389 )

U.S. President Barack Obama (C) and his family walk to the helicopter to depart for travel to Africa from the South Lawn of the White House in Washington, June 26, 2013. Obama's weeklong trip to Senegal, Tanzania and South Africa risks being overshadowed by the deteriorating health of South Africa's national hero and revered former leader, Nelson Mandela. Also pictured are Obama's mother-in-law Marian Robinson (L-R), his niece Leslie Robinson, his daughter Malia, first lady Michelle Obama and daughter Sasha. REUTERS/Jonathan Ernst ( OBAMA/ )

Nelson Mandela's daughter, Zindzi Mandela (R) is hugged by an unidentified person as she arrives at the Medi Clinic Heart hospital in Pretoria on June 26, 2013, where former South Africa's president Nelson Mandela lays in critical condition. FILIPPO MONTEFORTE/AFP/Getty Images ( 520905095 )

Nelson Mandela's daughter Makaziwe (L) and granddaughter Indileka leave the Medi Clinic Heart hospital in Pretoria on June 26, 2013. Emotional crowds gathered outside the hospital where Nelson Mandela lay in critical condition Wednesday, as relatives and clan elders made preparations for the revered former South African leader's final journey. Singing supporters amassed outside the Pretoria hospital where the 94-year-old anti-apartheid hero was fighting for his life. MARCO LONGARI/AFP/Getty Images ( 520895589 )

PRETORIA, SOUTH AFRICA - JUNE 26: A man paints a picture as people gather to leave messages of support for former South African President Nelson Mandela outside the Mediclinic Heart Hospital June 26, 2013 in Pretoria, South Africa. South African President Jacob Zuma confirmed on June 23 that Mandela's condition has become critical since he was admitted to the hospital over two weeks ago for a recurring lung infection. (Photo by Jeff J Mitchell/Getty Images) ( 171538552 )

PRETORIA, SOUTH AFRICA - JUNE 26: A woman wearing earrings depicting former South African President Nelson Mandela joins other people gathering to leave messages of support for him outside the Mediclinic Heart Hospital June 26, 2013 in Pretoria, South Africa. South African President Jacob Zuma confirmed on June 23 that Mandela's condition has become critical since he was admitted to the hospital over two weeks ago for a recurring lung infection. (Photo by Jeff J Mitchell/Getty Images) ( 171538546 )

A student chants a prayer as his class visits Medi-Clinic Heart Hospital to pay respect where ailing former South African President Nelson Mandela is being treated in Pretoria June 26, 2013. REUTERS/Dylan Martinez ( MANDELA/ )

PRETORIA, SOUTH AFRICA - JUNE 26: People gather to leave messages of support for former South African President Nelson Mandela outside the Mediclinic Heart Hospital June 26, 2013 in Pretoria, South Africa. South African President Jacob Zuma confirmed on Sunday that Mandela's condition has become critical since he was admitted to the hospital over two weeks ago for a recurring lung infection. (Photo by Jeff J Mitchell/Getty Images) ( 171531703 )

Children play in front of a mural showing former South African president Nelson Mandela on June 26, 2013 in Soweto, as the former president spends his 19th day in the Mediclinic heart hospital in Pretoria. Emotional crowds gathered outside the hospital where Nelson Mandela lay in critical condition Wednesday, as relatives and clan elders made preparations for the revered former South African leader's final journey. Singing supporters amassed outside the Pretoria hospital where the 94-year-old anti-apartheid hero was fighting for his life. ALEXANDER JOE/AFP/Getty Images ( 520897772 )

PRETORIA, SOUTH AFRICA - JUNE 25: People gather to watch television news reporters outside of the Mediclinic Heart Hospital where former South African President Nelson Mandela is being treated June 25, 2013 in Pretoria, South Africa. South African President Jacob Zuma confirmed on June 23 that Mandela's condition has become critical since he was admitted to the hospital over two weeks ago for a recurring lung infection. (Photo by Chip Somodevilla/Getty Images) ( 171488998 )

A community group from Pretoria sing hymns and songs from the apartheid era, to show their appreciation and support for former South African President Nelson Mandela, on the street outside the Mediclinic Heart Hospital where he is being treated in Pretoria, South Africa Tuesday, June 25, 2013. South Africa's president Jacob Zuma on Tuesday urged his compatriots to show their appreciation for Nelson Mandela, who is in critical condition in a hospital, by marking his 95th birthday next month with acts of goodness that honor the legacy of the anti-apartheid leader. (AP Photo/Ben Curtis) ( South Africa Mandela )

PRETORIA, SOUTH AFRICA - JUNE 25: People gather to watch television news reporters outside of the Mediclinic Heart Hospital where former South African President Nelson Mandela is being treated June 25, 2013 in Pretoria, South Africa. South African President Jacob Zuma confirmed Sunday that Mandela's condition has become critical since he was admitted to the hospital over two weeks ago for a recurring lung infection. (Photo by Chip Somodevilla/Getty Images) ( 171477629 )

A child from a community group from Pretoria holds flowers and sings religious songs to show appreciation and support for former South African President Nelson Mandela, on the street outside the Mediclinic Heart Hospital where he is being treated in Pretoria, South Africa Tuesday, June 25, 2013. South Africa's president Jacob Zuma on Tuesday urged his compatriots to show their appreciation for Nelson Mandela, who is in critical condition in a hospital, by marking his 95th birthday next month with acts of goodness that honor the legacy of the anti-apartheid leader. (AP Photo/Ben Curtis) ( South Africa Mandela )

A woman leans against a bust of former South African President Nelson Mandela, outside Royal Festival Hall in London June 25, 2013. Mandela remained in a critical condition in hospital on Tuesday after being admitted more than two weeks ago with a lung infection, the government said. The statue was erected in 1985, before his release after 27 years captivity in 1990, his award of the Nobel Peace Prize in 1993 and his election as president of the Republic of South Africa in 1994. REUTERS/Chris Helgren ( MANDELA/ )

Two wellwishers arrive carrying placards in support of former South African President Nelson Mandela, whose clan name is Madiba, outside the entrance to the Mediclinic Heart Hospital where he is being treated in Pretoria, South Africa Tuesday, June 25, 2013. South Africa's president Jacob Zuma on Tuesday urged his compatriots to show their appreciation for Nelson Mandela, who is in critical condition in a hospital, by marking his 95th birthday next month with acts of goodness that honor the legacy of the anti-apartheid leader. (AP Photo/Ben Curtis) ( South Africa Mandela )

Membes of the media reads newspapers outside the Mediclinic heart hospital in Pretoria on June 25, 2013. Nelson Mandela spent a second night in critical condition in hospital with his family members, compatriots and well-wishers worldwide fearing that the anti-apartheid icon is about to lose his final struggle. A few vehicles were seen early on June 25, 2013 entering and exiting the Pretoria hospital where the former South African president is being treated, but otherwise the scene was quiet except for the now normal pack of journalists. ALEXANDER JOE/AFP/Getty Images ( 520867301 )

Grandson Ndaba Mandela (L) speaks with an unidentified man at an area within the property of former South African President Nelson Mandela's house in Qunu, June 25, 2013. South Africans adopted a mood of sombre resignation on Monday to the inevitability of saying goodbye to former president Mandela after the 94-year-old anti-apartheid leader's condition in hospital deteriorated to critical. REUTERS/Rogan Ward ( MANDELA/ )

Unidentiified man sits next to a mural of the former South African President Nelson Mandela at Thokoza Park, Soweto township in Johannesburg, South Africa, Sunday, June 25, 2013. South Africa's president Jacob Zuma on Tuesday urged his countrymen to show their appreciation for Nelson Mandela, who is in critical condition in a hospital, by marking his 95th birthday next month with acts of goodness that honor the legacy of the anti-apartheid leader. (AP Photo/Themba Hadebe) ( South Africa Mandela )

A group of police cadets from Pretoria leave flowers outside the entrance to the Mediclinic Heart Hospital where former South African President Nelson Mandela is being treated in Pretoria, South Africa Tuesday, June 25, 2013. South Africans passed by Nelson Mandela's home in a Johannesburg suburb on Tuesday and said they were praying for the 94-year-old after the president Jacob Zuma urged the country to send their wishes to the man he called the "father of democracy," who remained in critical condition. (AP Photo/Ben Curtis) ( South Africa Mandela )

PRETORIA, SOUTH AFRICA - JUNE 25: One of the dozens of hand-made messages of support for former South African President Nelson Mandela posted to the wall outside the Mediclinic Heart Hospital June 25, 2013 in Pretoria, South Africa. South African President Jacob Zuma confirmed Sunday that Mandela's condition has become critical since he was admitted to the hospital over two weeks ago for a recurring lung infection. (Photo by Chip Somodevilla/Getty Images) ( 171471209 )

PRETORIA, SOUTH AFRICA - JUNE 25: One of the dozens of hand-made messages of support for former South African President Nelson Mandela posted to the wall outside the Mediclinic Heart Hospital June 25, 2013 in Pretoria, South Africa. South African President Jacob Zuma confirmed Sunday that Mandela's condition has become critical since he was admitted to the hospital over two weeks ago for a recurring lung infection. (Photo by Chip Somodevilla/Getty Images) ( 171473239 )

PRETORIA, SOUTH AFRICA - JUNE 25: One of the dozens of hand-made messages of support for former South African President Nelson Mandela posted to the wall outside the Mediclinic Heart Hospital June 25, 2013 in Pretoria, South Africa. South African President Jacob Zuma confirmed Sunday that Mandela's condition has become critical since he was admitted to the hospital over two weeks ago for a recurring lung infection. (Photo by Chip Somodevilla/Getty Images) ( 171471212 )

PRETORIA, SOUTH AFRICA - JUNE 25: One of the dozens of hand-made messages of support for former South African President Nelson Mandela posted to the wall outside the Mediclinic Heart Hospital June 25, 2013 in Pretoria, South Africa. South African President Jacob Zuma confirmed Sunday that Mandela's condition has become critical since he was admitted to the hospital over two weeks ago for a recurring lung infection. (Photo by Chip Somodevilla/Getty Images) ( 171471694 )

PRETORIA, SOUTH AFRICA - JUNE 25: Dozens of hand-made messages of support for former South African President Nelson Mandela are posted to the wall outside the Mediclinic Heart Hospital June 25, 2013 in Pretoria, South Africa. South African President Jacob Zuma confirmed Sunday that Mandela's condition has become critical since he was admitted to the hospital over two weeks ago for a recurring lung infection. (Photo by Chip Somodevilla/Getty Images) ( 171473678 )

Children play by an information board at a house former President Nelson Mandela stayed in during the 1940s, in Johannesburg's Alexandra township June 25, 2013. Mandela remained in a critical condition in hospital on Tuesday after being admitted more than two weeks ago with a lung infection, the government said. REUTERS/Kevin Coombs ( MANDELA/ )

A U.S. helicopter flies in the sky over Pretoria, not far from the Mediclinic Heart Hospital where former South African President Nelson Mandela is being treated, in South Africa Tuesday, June 25, 2013. South African President Jacob Zuma told dozens of foreign and South African journalists on Monday that President Barack Obama would go ahead with a visit to South Africa, despite concerns about Mandela's health. (AP Photo/Ben Curtis) ( South Africa Mandela )

PRETORIA, SOUTH AFRICA - JUNE 25: Florence Nyadzani (C), 58, leads people in songs and cheers of support outside of the Mediclinic Heart Hospital where former South African President Nelson Mandela is being treated June 25, 2013 in Pretoria, South Africa. "I got my freedom because of Mandela," Nyadzani said. "We pray every day because we love him." South African President Jacob Zuma confirmed on June 23 that Mandela's condition has become critical since he was admitted to the hospital over two weeks ago for a recurring lung infection. (Photo by Chip Somodevilla/Getty Images) ( 171486377 )

PRETORIA, SOUTH AFRICA - JUNE 25: A large crowd of supporters sings the South African national anthem outside of the Mediclinic Heart Hospital where former South African President Nelson Mandela is being treated June 25, 2013 in Pretoria, South Africa. South African President Jacob Zuma confirmed on June 23 that Mandela's condition has become critical since he was admitted to the hospital over two weeks ago for a recurring lung infection. (Photo by Chip Somodevilla/Getty Images) ( 171486461 )

Well wishers place painted stones with messages and flowers outside former South African President Nelson Mandela's residence in Johannesburg on June 25, 2013. Mandela is receiving treatment at the Mediclinic heart hospital in Pretoria. Mandela's close family gathered today at his rural homestead to discuss the failing health of the South African anti-apartheid icon who was fighting for his life in hospital. Messages of support poured in from around the world for the Nobel Peace Prize winner, who spent 27 years behind bars for his struggle under white minority rule and went on to become South Africa's first black president. ODD ANDERSEN/AFP/Getty Images ( 520873917 )

PRETORIA, SOUTH AFRICA - JUNE 25: Metropolitan Police keep order as people line the street outside of the Mediclinic Heart Hospital where former South African President Nelson Mandela is being treated June 25, 2013 in Pretoria, South Africa. South African President Jacob Zuma confirmed on June 23 that Mandela's condition has become critical since he was admitted to the hospital over two weeks ago for a recurring lung infection. (Photo by Chip Somodevilla/Getty Images) ( 171489006 )

PRETORIA, SOUTH AFRICA - JUNE 25: A large crowd of supporters sing songs of support outside of the Mediclinic Heart Hospital where former South African President Nelson Mandela is being treated June 25, 2013 in Pretoria, South Africa. South African President Jacob Zuma confirmed on June 23 that Mandela's condition has become critical since he was admitted to the hospital over two weeks ago for a recurring lung infection. (Photo by Chip Somodevilla/Getty Images) ( 171488517 )

PRETORIA, SOUTH AFRICA - JUNE 25: A crowd gathers to watch television news reporters outside of the Mediclinic Heart Hospital where former South African President Nelson Mandela is being treated June 25, 2013 in Pretoria, South Africa. South African President Jacob Zuma confirmed Sunday that Mandela's condition has become critical since he was admitted to the hospital over two weeks ago for a recurring lung infection. (Photo by Chip Somodevilla/Getty Images) ( 171477633 )

PRETORIA, SOUTH AFRICA - JUNE 25: People gather to watch television news reporters outside of the Mediclinic Heart Hospital where former South African President Nelson Mandela is being treated June 25, 2013 in Pretoria, South Africa. South African President Jacob Zuma confirmed Sunday that Mandela's condition has become critical since he was admitted to the hospital over two weeks ago for a recurring lung infection. (Photo by Chip Somodevilla/Getty Images) ( 171477626 )

Locals stroll past a mural, outside the house former President Nelson Mandela stayed in the 1940s, in Johannesburg's Alexandra township June 25, 2013. Mandela remains in a critical condition in hospital after being admitted more than two weeks ago with a lung infection, the government said on Tuesday. REUTERS/Dylan Martinez ( MANDELA/ )

A woman from a community group from Pretoria sheds a tear as she holds a candle, as she and others show their appreciation and support for former South African President Nelson Mandela, on the street outside the Mediclinic Heart Hospital where he is being treated in Pretoria, South Africa Tuesday, June 25, 2013. South Africa's president Jacob Zuma on Tuesday urged his compatriots to show their appreciation for Nelson Mandela, who is in critical condition in a hospital, by marking his 95th birthday next month with acts of goodness that honor the legacy of the anti-apartheid leader. (AP Photo/Ben Curtis) ( South Africa Mandela )

This photo taken on the night of June 24, 2013 shows journalists waiting outside the Mediclinic Heart Hospital in Pretoria where former South African President Nelson Mandela is receiving treatment. Nelson Mandela's close family gathered on June 25 at his rural homestead to discuss the failing health of the South African anti-apartheid icon who was fighting for his life in hospital. Messages of support poured in from around the world for the Nobel Peace Prize winner, who spent 27 years behind bars for his struggle under white minority rule and went on to become South Africa's first black president. STEPHANE DE SAKUTIN/AFP/Getty Images ( 520870959 )

Makaziwe Mandela (R), the daughter of former South African President Nelson Mandela, arrives with Ndileka Mandela (L) and Tukwini Mandela, the granddaughters, at the Mediclinic heart hospital in Johannesburg on June 25, 2013. A statement issued by the South African government reported that Mandela's health was in a critical stage after his condition in hospital worsened over the course of 24 hours. ALEXANDER JOE/AFP/Getty Images ( 520875954 )

A woman from a community group based in Pretoria holds a candle and sings religious songs to show appreciation and support for former South African President, Nelson Mandela, on the street outside the Mediclinic Heart Hospital where he is being treated in Pretoria, South Africa Tuesday, June 25, 2013. South Africa's president Jacob Zuma on Tuesday urged his compatriots to show their appreciation for Nelson Mandela, who is in critical condition in a hospital, by marking his 95th birthday next month with acts of goodness that honor the legacy of the anti-apartheid leader. (AP Photo/Ben Curtis) ( South Africa Mandela )

A boy holds a picture of Nelson Mandela during a candle lit vigil outside the Mediclinic Heart Hospital in Pretoria where a community group prayed and sang religious songs in support of Mandela who is receiving treatment there, on June 25, 2013. Mandela's close family gathered today at his rural homestead to discuss the failing health of the South African anti-apartheid icon who was fighting for his life in hospital. Messages of support poured in from around the world for the Nobel Peace Prize winner, who spent 27 years behind bars for his struggle under white minority rule and went on to become South Africa's first black president. ODD ANDERSEN/AFP/Getty Images ( 520878526 )