South Africans attend the memorial service of former president Nelson Mandela at the FNB Stadium in Johannesburg on December 10, 2013. Mandela, revered icon of the anti-apartheid struggle, died in Johannesburg on December 5 at age 95.

US President Barack Obama led world tributes to Nelson Mandela Tuesday, hailing him as 'a giant of history' at a rain-soaked memorial attended by tens of thousands of South Africans united in proud, noisy celebration.

The FNB stadium in Johannesburg was packed with people who came to remember South Africa's first democratically-elected leader and anti-apartheid icon. 

"He was not a bust made of marble, he was a man of flesh and blood," Obama said of Mandela. "It is hard to eulogize any man... how much harder to do so for a giant of history, who moved a nation towards justice."

UN Secretary General Ban Ki-moon said, "He showed the awesome power of forgiveness — and of connecting people with each other... the true meaning of peace."

The memorial service — a prelude to Mandela's state funeral on Sunday, Dec. 15 — began around an hour behind schedule, at 12 p.m. local time and wrapped up around four hours later.

By late morning, thousands were filing into the stadium in the city's Soweto area amid long lines and pouring rain. Many of the venue's 95,000 seats went empty, possibly due to the wet weather or the fact that the service took place on a work day. 

Hosting the ceremony, Cyril Ramaphosa, fellow anti-apartheid activist and deputy president of Mandela's African National Congress party, said the rain was a good omen.

"When it rains when you are buried, it means your gods are welcoming you and the gates of heaven are most probably open as well," Ramaphosa said.

More than 70 current or former world leaders were expected, more than have attended any such service since Pope John Paul II's funeral in 2005.

Alongside Mandela's family and South Africa's President Jacob Zuma, foreign dignitaries including Obama, the UN Secretary General, President Dilma Rousseff of Brazil and Cuban President Raul Castro addressed the service. 

Other famous guests included retired archbishop Desmond Tutu, actress Charlize Theron, supermodel Naomi Campbell and U2 frontman Bono.

The stadium was the site of Mandela's final appearance in public, when he attended the 2010 soccer World Cup final.

Watch Obama's full speech:

Here is the full text of Obama's speech:


Remarks by President Obama

Agence France-Presse contributed to this report.

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