Six countries have declined to attend the Nobel Peace Prize ceremony for jailed Chinese dissident Liu Xiaobo.
The Norwegian Nobel Committee said the ambassadors who were not going were from China, Russia, Kazakhstan, Cuba, Morocco, and Iraq.
Committee secretary Geir Lundestad said they had given no reason for declining.
Mr Lundestad said Beijing had mounted an unprecedented campaign to sabotage participation in the ceremony, which will be held on 10 December.
"I don't know of any example where a country has so actively and directly tried to have ambassadors stay away from a Nobel ceremony," he said.
Earlier this month, China warned that there would be "consequences" if governments showed support for Liu Xiaobo at the award ceremony.
The government in Beijing says Mr Liu is a "criminal".
The 54-year-old dissident received an 11-year sentence last year for "inciting subversion" after drafting Charter 08 - which called for multi-party democracy and respect for human rights in China.
A spokesman for the Russian Embassy in Oslo, Vladimjir Isupov, said the ambassador would not be in Norway at the time of the award ceremony.
"It is not politically motivated and we do not feel we are pressured by China," he told Associated Press.
BBC News