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 anti-government 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.
Demonstrations against a now-suspended extradition bill have since turned into wider demands for more autonomy in the former British colony.
Hong Kong police on Friday appealed to members of the public to cut ties with “violent protesters”, and warned people not to take part in a march originally planned for Saturday which had not received official approval.
The Demosisto party says Mr Wong, 23, was “suddenly pushed into a private car on the street” while walking to a train station at around 07:30 (23:30 GMT Thursday).
Both he and Ms Chow were taken to police headquarters in Wan Chai. Mr Wong later tweeted to say their “fundamental rights” were being “eroded”.
Both activists were charged with unlawfully organising a 21 June rally at which protesters blockaded police headquarters for 15 hours. The case was adjourned until November and the activists were released on bail.
In a Facebook post, Demosisto called the arrests a “political operation” and warned that they could lead to “a deadly situation that is more difficult to resolve”.
Andy Chan, founder of the Hong Kong National Party which campaigns for the territory’s independence, says he was detained on Thursday night while trying to board a flight from Hong Kong airport.
He was arrested on suspicion of rioting and assaulting a police officer, according to local outlet HKFP.
EU foreign policy chief Federica Mogherini expressed concern about the arrests, and said the EU would continue to push for a “more positive trend” in the territory.
“The developments in Hong Kong over these last hours are extremely worrying,” she told reporters after a meeting of EU foreign ministers in Helsinki.
“We expect the authorities in Hong Kong to respect the freedom of assembly, expression and association as well as the right of people to demonstrate peacefully.”
Joshua Wong is a well-known pro-democracy activist who played a leading role in the 2014 rallies known as Hong Kong’s “Umbrella protests” – so-called because protesters used umbrellas to shield themselves from police pepper spray.
