Marine One, Flies over Pretoria, as Obama arrives to meet South African President Jacob Zuma

Marine One, with US President Barack Obama and First Lady Michelle Obama on board

Flies over Pretoria, as Obama arrives to meet South African President Jacob Zuma
Marine One, with US President Barack Obama and First Lady Michelle Obama on board, flies over Pretoria, as Obama arrives to meet South African President Jacob Zuma

Helicopters including Marine One sit on the grass in front of the Union Buildings in Pretoria, South Africa

A man wears a T-shirt with a portrait of US President Barack Obama outside the Medi-Clinic Heart Hospital where former South African President Nelson Mandela is being treated in Pretoria

Obama answers questions from via video link during a meeting with the young African leaders at the University of Johannesburg in Soweto

Protesters gather outside Johannesburg University in Soweto in advance of President Barack Obama's meeting with students in Johannesburg, South Africa

Protesters scuffle with police outside Johannesburg University in Soweto in advance of Barack Obama's meeting with students later today in Johannesburg, South Africa. This is Obama's first official visit to South Africa, and he is holding bilateral meetings with President Jacob Zuma, and also meeting with students in Soweto Township. During his tour the president will also visit Robben Island, where former President Nelson Mandela spent some of his 27 years in prison for fighting against apartheid

An official South African government-issued photo of South African President Jacob Zuma and his wife Tobeka Zuma standing alongside US President Barack Obama and his wife Michelle Obama as they wave to onlookers outside the Union Buildings in Pretoria

Protesters gather on wasteland outside Johannesburg University in Soweto in advance of President Barack Obama's meeting with students in Johannesburg, South Africa

US President Barack Obama and South African President Jacob Zuma give a press conference at the Union Building in Pretoria, South Africa. Zuma welcomed Barack Obama to South Africa, saying the first black US president carried with him the dreams of millions of Africans. During a landmark visit which has been overshadowed by Nelson Mandela's failing health, Zuma said Mandela and Obama were 'bound by history' as the first black leaders of their respective nations

Police use stun grenades in an attempt to disperse protesters outside the University of Johannesburg in Soweto, ahead of a visit by US President Barack Obama

A young man shows his excitement as Obama calls on him for a question

Sasha Obama and her cousin Leslie Robinson sit and listen to Michelle Obama speak at a youth event

First lady Michelle Obama waves to participants after a virtual discussion event with young people at the Sci-Bono Discovery Centre in Johannesburg

Michelle Obama hugs Tebogo Tenyan, 16, during a youth event

Obama answers questions from the audience and from people in Nigeria, Uganda and Kenya via live video link during a meeting with the young African leaders at the University of Johannesburg in Soweto

Obama toasts with his wife Michelle during an official dinner hosted by South African president Jacob Zuma at the Presidential Guest House in Pretoria