Barack Obama, the US president, has received the Nobel Peace Prize at a ceremony in Oslo - days after he ordered an escalation of US involvement in the war in Afghanistan.

In making Obama the third sitting US President to win the award, the Norwegian Nobel Committee praised Obama's co-operative approach to global issues.

But many critics say that Obama's resume is too thin to stand scrutiny with other Nobel peace laureates.

And for many Afghans, Obama's strategy of even more troops does not fit into their vision of what will bring peace. From Kabul, Steve Chao reports.