More than 50 activists were arrested in Hong Kong on Wednesday on the basis of the controversial Chinese security law that was introduced last summer.
According to foreign media, this is the largest action against the incumbent government since the new law was passed.
Among those arrested are well-known leaders of the democratic movement, including some former opposition parliamentarians.
The Democratic Party reports on its Facebook page that James To, Lam Cheuk Ting and Lester Shum, among others, have been arrested.
Police declined to comment.
The Democratic Party argues that the activists were arrested by police for running in an election to select democracy-minded candidates for the upcoming parliamentary elections.
Local authorities and Beijing had already warned that the election could be in breach of security law.
The proposed election participation by the Democratic Party is seen by the authorities as "an act of undermining the national security law," the Democratic Party said.
Hong Kong's parliamentary elections were postponed last year.
According to the government, this happened in connection with the corona pandemic.
Hong Kong activists plead guilty: 'show the value of freedom'
American lawyer also arrested
In addition to dozens of opposition members, an American has also been arrested on suspicion of violating national security law, Hong Kong public broadcaster
reported on Wednesday
It concerns lawyer John Clancey, who works for a law firm that regularly intervenes in human rights cases.
Clancey also chairs the Asian Human Rights Commission and is associated with the pro-democratic opposition in Hong Kong.
Beijing enacted a new national security law in June for the recalcitrant former British crown colony.
That law criminalizes anything that is seen by China as separatist or subversive.
Cooperation with foreign powers and conspiracy can also result in a life sentence.
Western countries and human rights organizations strongly condemned the new law, calling it an attempt by Beijing to crack down on the Hong Kong opposition.
Since the introduction of the security law, several countries have introduced sanctions against Hong Kong.
See also: What is the controversial China law that Hong Kongers have been angry about for weeks?