Dozens of Chinese who openly agreed with imprisoned Nobel Peace Prize winner Liu Xiaobo say they have been detained, roughed up, harassed or kept from leaving their homes in recent days.
Liu won the prize for his decades of promoting democratic change in China. He is serving an 11-year prison sentence for subversion.
Some of Liu's supporters say they received threatening phone calls from police before they released a letter late Thursday calling for Liu to be freed.
Beijing police have not immediately responded Friday to a faxed question about the complaints of harassment.
China's state-run media has reacted angrily to the peace prize, calling it a tool the West is using to undermine China.