U.S. President Barack Obama delivers his speech at the memorial service for late South African President Nelson Mandela at the First National Bank soccer stadium, also known as Soccer City, in Johannesburg
Brazilian President Dilma Rousseff (R) arrives at the First National Bank (FNB) Stadium, also known as Soccer City, ahead of the national memorial service for the late former South African President Nelson Mandela in Johannesburg
Former U.S. President George W. Bush (top R) talks to former British Prime Minister Gordon Brown (top L) as they attend the memorial service for late South African President Nelson Mandela at the First National Bank soccer stadium
U.S. President Barack Obama (C) shares a moment with Denmark's Prime Minister Helle Thorning-Schmidt (L) as his wife, first lady Michelle Obama looks on (R) during the memorial service for late South African President Nelson Mandela at the First National Bank stadium
Former South African President Frederik Willem de Klerk (C) arrives for the memorial service for late South African President Nelson Mandela at the FNB soccer stadium in Johannesburg
Britain's Prime Minister David Cameron attends the Memorial Service for former South African President Nelson Mandela at the First National Bank Stadium
South African President Jacob Zuma holds the official program for the memorial service for late South African President Nelson Mandela at the FNB soccer stadium in Johannesburg
Mandla Mandela (C), eldest grandson of former South African President Nelson Mandela, attends the official memorial service for Nelson Mandela at the First National Bank stadium
U.S. President Barack Obama (2nd R) pays his respect to former South African President Nelson Mandela's widow Graca Machel (2nd L) after his speech at the memorial service for late South African President Nelson Mandela at the First National Bank stadium
Former French President Nicolas Sarkozy (center row L) and his successor Francois Hollande (center row R) attend the memorial service for late South African President Nelson Mandela at the First National Bank soccer stadium
Cuba's President Raul Castro (L) and his Brazilian counterpart Dilma Rousseff attend the memorial service for late South African President Nelson Mandela at the FNB soccer stadium in Johannesburg
South Africans brave the rain as they listen to U.S. President Barack Obama speak during a memorial service for Nelson Mandela at FNB Stadium in Johannesburg