Human Rights Watch says a Chinese dissident has been released after spending 13 years in a state-run mental asylum.

The New York-based organization said Wednesday, Wang Wanxing was freed in August and immediately left for Germany, where his wife and daughter have been living.

Mr. Wang was arrested in Beijing in 1992 after staging a brief demonstration on the anniversary of the 1989 crackdown on pro-democracy protesters in Tiananmen Square. Human Rights Watch says Mr. Wang describes suffering various abuses and witnessing others in the psychiatric hospital. China's Foreign Ministry had no immediate comment on the report.

His release came shortly before a visit to China by the United Nations High Commissioner for Human Rights, Louise Arbour. China often releases jailed dissidents ahead of visits by high-profile officials from Western countries and the United Nations.

Some information for this report provided by AFP.