Barack Obama picks up Nobel Peace Prize in Oslo

US President Barack Obama has accepted his Nobel Peace Prize at a ceremony in Norway's capital, Oslo.

In his acceptance speech, he said his accomplishments were slight compared with some previous laureates.

He defended the US role in Afghanistan, saying sometimes war was necessary, but a just war could lead to a just peace.

Mr Obama was given the prize in October for his "extraordinary efforts to strengthen international diplomacy and co-operation between peoples".

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