Pro-democracy activists are challenging China's efforts to control protests on the eve of the Beijing Olympics.
Two British activists deported from China for a "Free Tibet" protest earlier this week vowed Thursday that there will be more demonstrations.
The pair (Iain Thom and Lucy Fairbrother) said in London they are part of a larger campaign that will continue in their absence.
China ordered the Britons and two Americans to leave the country Wednesday for unfurling "Free Tibet" banners near the Beijing Olympic stadium.
Separately, Reporters Without Borders has filed a legal challenge against the French police for prohibiting a demonstration outside the Chinese Embassy in Paris.
The media rights group said Thursday it is planning protests outside Chinese embassies in seven countries to draw attention to the plight of jailed Chinese journalists and human rights activists.
The group says Paris is the only city to block the demonstrations.
Parisian police have prohibited all gatherings near the Chinese embassy from Thursday morning until Friday at midnight. The order cites fears that a protest could lead to violence and public disturbances.
In Hong Kong Thursday, authorities banned three prominent Chinese activists from entering the territory, which is hosting the Olympic equestrian events.
The U.S.-based activists had planned to hold peaceful pro-democracy protests. One of the activists (Yang Jianli) spent five years in a Chinese prison for alleged espionage.
Hong Kong is a former British colony now ruled by Beijing. It enjoys greater civil liberties than mainland China, but authorities have tightened controls on demonstrations because of the Olympics.