Hong Kong police on Thursday raided a museum that houses exhibits commemorating Beijing's deadly crackdown on Tiananmen Square in 1989.
The reason for the raid was unclear. Police officers were seen carrying exhibits out of the June 4 Museum. They also confiscated computers and documents from the museum.
Among the exhibits seen being removed was a paper model of the Goddess of Democracy - a symbol of the 1989 pro-democracy student movement in Beijing.
Four members of the group, the Hong Kong Alliance in Support of Patriotic Democratic Movements of China, that ran the museum, were detained on Wednesday, including prominent pro-democracy activist Chow Hang Tung. The arrests were made under the national security law and Chow along with other members have been charged with "inciting subversion of state power". Critics say it is aimed at crushing dissent but China says it is meant to maintain stability.