Nobel peace ceremony goes ahead, with empty chair

As China tightens its grip on dissidents at home, dignitaries in Norway celebrate this year's winner of the Nobel Peace Prize, imprisoned Chinese activist Liu Xiaobo, with solemn ceremony - and an empty chair.

Liu won't be able to collect the prestigious $1.4 million award at the Oslo ceremony on Friday - the first time in 74 years that it has not been handed over. (AP)