South African President Nelson Mandela (L) talks with Pope John Paul II during their meeting at the Vatican 18 June 1998. Mandela thanked the Pope for the Catholic Church's help in education and health care of black South Africans when the white minority government wrote them off as second-class citizens. AFP PHOTO PAOLO COCCO POOL

Former South African President, Nelson Mandela, at a news conference in johannesburg Thursday, Feb. 17, 2005 to promote the 46664 HIV/AIDS awareness concert to be held in George South Africa on March 19th. The concert will include international artists Annie Lennox, India Arie, Katie Melua and Queen's Brian May. American actor Will Smith will act as master of ceremonies. 46664 is the prisoner number given to Mandela during his 27 years of imprisonment during the apartheid era. (AP Photo/Denis Farrell)

President of the African National Congress Nelson Mandela, right, visits residents of a squatter camp, Sunday, May 31, 1992, Phola Park, South Africa. The camp has been ringed with razor wire while police conduct searches for suspected arms caches. Mandela warned that black township violence could spread if the government failed to stop it. (AP Photo/Greg Marinovich)

Former South African president, Nelson Mandela, makes a press statement in Johannesburg Tuesday June 14, 2005 after President Thabo Mbeki dismissed his deputy, Jacob Zuma during an address to parliament in Cape Town. Zuma was caught up in a corruption scandal, throwing wide open the question of who will become the next leader of South Africa. (AP Photo/Themba Hadebe)

Nelson Mandela holds up two pens given to him by the Union of Mine Workers at his victory celebration on Monday, May 2, 1994 in Johannesburg. Mandela was celebrating the win which is set to sweep him and the ANC to power after South Africa's first all-race elections. The mine workers asked him to sign the new constitution and other important documents with the pens. (AP Photo/ John Parkin)

Former South African president Nelson Mandela arrives for President Thabo Mbeki's swearing in ceremony for a second and final term Tuesday April 27, 2004 at the Union Buildings in Pretoria, as the country celebrates the 10th anniversary of the end of apartheid. (AP Photo/Alexander Joe; Pool)

African National Congress leader Nelson Mandela, left, shakes hands with Paris Mayor Jacques Chirac upon his arrival at the Paris town-hall Thursday, June 7, 1990. Mandela arrived in Paris on Wednesday night for a two-day official visit. (AP Photo/Jose Goitia)

South Africa, Western Cape Province, Winelands, Berg River valley, Groot Drakenstein jail, the statue of Nelson Mandela named "Long walk to freedom" made by the artist Jean Doyle de Tokyo Sexwale

Former South African President, Nelson Mandela, speaks at a news conference in Johannesburg Tuesday June 1, 2004. Mandela, who has kept a hectic schedule in the public eye since his retirement five years ago, appealed for time to spend with his family and friends. (AP Photo/str)

Former U.S. Secretary of State Henry Kissinger, left, and African National Congress (ANC) president Nelson Mandela shake hands during their meeting in Johannesburg, South Africa, Wednesday, April 13, 1994. Kissinger is in South Africa to try to end the bloody dispute between the ANC and the Zulu Inkatha Freedom Party, who are opposed to the upcoming all-race general elections. (AP Photo/John Parkin)

Jailed ANC leader, Nelson Mandela, pictured in 1952 at the law office he opened with his colleague, Oliver Tambo. This was the first black legal practice in Johannesburg, South Africa. Both were founding members of the African National Congress Youth League. The words ?Mandela? and ?Tambo? were written across the frosted window panes on the second floor ? an uncommon sight in South Africa at that time. (AP Photo/Jurgen Schadenberg)

** FILE ** Former hardline president P.W. Botha, left, addresses a press conference with former President Nelson Mandela, in this Nov. 1995 file photo. South Africa's last white president P.W. Botha has died at the age of 90, according to South African media, Tuesday, Oct. 31, 2006. (AP Photo)

Nelson Mandela, the released leader of the African National Congress (ANC), sits in the car with his youngest grandchild, Bambata Mandela, at the airport in Cape Town, South Africa, Monday, Feb. 12, 1990. Mandela and his family are on their way back to their Johannesburg home, one day after he was released from 27 years in jail. (AP Photo/Adil Bradlow)

Nelson Mandela, President of the African National Congress, listens to questions during a news conference at the United Nations on Tuesday, Dec. 4, 1991 in United Nations. During a speech to the General Assembly, Mandela urged the U.N. to continue sanctions against South until a new constitution is written that follows for black majority rule. (AP Photo/Bebeto Matthews)

Former South African President Nelson Mandela, holds the Olympic Torch outside Robben Island Prison in Cape Town, South Africa, Saturday, June, 12, 2004 The Olympic flame is in South Africa as it makes its way around the world enroute for the Athens Olympics. (AP Photo/Obed Zilwa)

Former South African President Nelson Mandela, left, with former US President Bill Clinton, right, at Mandela's home in Johannesburg Tuesday July 19, 2005. Clinton had lunch with Mandela and is later scheduled to attend an annual lecture in honour of Mandela who turned 87 Monday. (AP Photo/Steve Lawrence) ** SOUTH AFRICA OUT **

Former South African President Nelson Mandela is all smiles as he lifts the World Cup trophy after it was announced by FIFA that South Africa will host the 2010 FIFA Worlld Cup, in Zurich, Switzerland, Saturday, May 15, 2004. FIFA's executive committee on Saturday picked South Africa ahead of Morocco and Egypt for the first World Cup to be staged in Africa. (AP Photo/Michael Probst)

Former US President, Bill Clinton (R) pays a visit to former South African President Nelson Mandela on July 17, 2012 at his home in Qunu, Eastern Cape, on the eve of Mandela's 94th birthday. AFP PHOTO/ CLINTON FOUNDATION / BARBARA KINNEY RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO/ CLINTON FOUNDATION / BARBARA KINNEY"- NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS

President George Bush shakes hands with the South African leader Nelson Mandela at the White House, Monday, June 25, 1990, Washington, DC. (AP Photo/Doug Mills)

South African President Nelson Mandela holds hands with his companion Graca Machel, the wife of the late Mozambique President Samora Machel, after she received an honourary degree at the University of Essex, in Colchester, east England Thursday July 10, 1997. Centre with eye patch is Mrs. Machel's son. (AP Photo/Max Nash)