BEIJING (AP) — An activist says Chinese police broke up a dinner party attended by activists in the eastern city of Hangzhou Tuesday night and detained a dozen people.

Activist Wang Wusi says he and another 10 people were released after spending about two hours in police custody. He says police are still holding activist Wen Kejian. He’s a signatory of Charter 08, a document calling for democracy and the end of one-party rule in China.

Wang said Wednesday that they were warned by police that they would not be allowed to meet. He says they decided to organize the event because of the recent detentions of other activists.

Hangzhou police did not answer repeated telephone calls seeking comment.

Chinese police have broken up previous dinner parties held by activists.