Beijing is prepared to sacrifice the Olympic Games to counter threats to national security, a US-based human rights group leader has said. John Kamm, executive director of the Dui Hua Foundation, which monitors mainland prisons and helps arrange prisoner releases, said Chinese officials had told him there was no question of the government allowing the Olympics to endanger the country's sovereignty or territorial integrity. 'They will sacrifice the Olympics to preserve national security,' Mr Kamm said. 'The government is adopting a hard position on Tibet. A senior official told me that any signs of concession would be seen as signs of weakness.' He said although the comment was made after the authorities intervened in the riots in Tibet this month, the stance had been consistent policy for a year. He also suggested that Beijing might free some people still jailed over the 1989 Tiananmen Square incident in an attempt to regain some ground it had lost on the public relations front. Mr Kamm estimated 60 to 100 people were still in prison for offences committed during the Tiananmen protests. An Olympic amnesty, especially for those branded as counter-revolutionaries, could boost the mainland's international image, he said. He estimated that about a year ago, between 200 and 300 people were still serving Tiananmen-related jail time and several individuals originally sentenced to death with two-year reprieves or jailed for life had been released over the last six months.