OSLO, Norway — With his Nobel Peace Prize diploma placed in his empty chair, imprisoned Chinese dissident Liu Xiaobo was given a standing ovation at the award ceremony today, as dignitaries demanded his release.

It was the first time in 74 years the prestigious $1.4 million award was not handed over, because Liu is serving an 11-year sentence in China on subversion charges for urging sweeping changes to Beijing’s one-party communist political system.

China was infuriated when the 54-year-old literary critic won, describing the award as an attack on its political and legal system. Authorities have placed Liu’s supporters, including his wife, Liu Xia, under house arrest to prevent anyone from picking up his prize.

In China, both CNN and BBC TV channels went black at 8 p.m. local time for nearly an hour, exactly when the Oslo ceremony took place.

In his speech, Norwegian Nobel Committee Chairman Thorbjorn Jagland called for Liu’s release, receiving an unusual standing ovation at the international gathering.

“He has not done anything wrong. He must be released,” Jagland said. He noted that neither Liu nor his closest relatives were able to attend the ceremony.