Hong Kong police have raided a museum run by a civic group that commemorates the deadly crackdown on pro-democracy protesters in Beijing's Tiananmen Square on June 4, 1989.
Police searched the June 4th Museum on Thursday. They confiscated items, including exhibit display panels and photographs.
The museum has stored material such as personal belongings of Tiananmen Square victims. Publicly discussing the incident is regarded as taboo in mainland China.
A group called the Hong Kong Alliance in Support of Patriotic Democratic Movements of China has operated the museum. The group played a central role in Hong Kong's pro-democracy movement, organizing large-scale rallies.
Following the raid, police charged the group and three of its senior members with inciting subversion in violation of the national security law for Hong Kong. The three include the group's chairperson Lee Cheuk-yan.
Authorities have been increasing pressure on the group, which plans to hold an extraordinary general meeting on September 25 to decide whether to disband.