Hong Kong police have arrested well-known activist leader Joshua Wong and core member Agnes Chow of the pro-democracy party Demosisto, on Friday, August 30.

In a clampdown on those involved in this summer’s protests, police have also swooped in, Thursday night, and arrested Andy Chan, leader of the pro-independence Hong Kong National Party, at the airport, as he was boarding a flight to Japan.

Wong and Chow’s arrest happen on the eve of another massive march planned for Saturday, August 31st that marks the fifth anniversary of Chinese Communist Party’s (CCP) ruling to ban fully democratic elections for the position of the Hong Kong leader.