Obama arrives in S. Africa for Mandela tribute

US President Barack Obama has arrived in South Africa to pay tribute to Nelson Mandela, the iconic leader and Nobel Peace Prize winner who died Thursday at age 95.

Obama will deliver a 20-minute speech during Tuesday's service in Johannesburg, where tens of thousands of South Africans and dozens of foreign dignitaries are expected to pack a sports stadium. Obama is expected to speak of Mandela's influence on South Africa and on his own life. (AP)