How many of them will be disappeared?

Several prominent Hong Kong democracy activists have been arrested in less than 24 hours amid a police crackdown.

Joshua Wong and Agnes Chow of the political party Demosisto were arrested on Friday for illegally organising a protest, before being released on bail.

Independence campaigner Andy Chan was arrested at the airport on Thursday while trying to fly to Japan.

They are among 900 people arrested since protests began in June.

Lawmaker Cheng Chung-tai of the localist Civic Passion party was also detained, his office said. It was unclear why he was held.