Pro-democracy activist Lester Shum is taken away by police officers after over 50 Hong Kong activists arrested under security law as crackdown intensifies, in Hong Kong, China January 6, 2021.

Li Kwai-wah, a senior superintendent at the national security department of the police force, attends a media briefing after over 50 Hong Kong activists were arrested under the national security law, in Hong Kong, China January 6, 2021.

Party members of the pro-democracy camp attend a news conference after over 50 Hong Kong activists were arrested under the national security law in Hong Kong, China January 6, 2021.

Journalists document through a car window as pro-democracy activist Benny Tai (2nd R) is taken to a police station in Hong Kong, China January 6, 2021.

Police stand guard outside pro-democracy activist Lester Shum's office as they searching for evidence after over 50 Hong Kong activists arrested under security law as crackdown intensifies, in Hong Kong, China January 6, 2021.

American lawyer John Clancey walks out of a building as he is taken away by police officers in Hong Kong, China January 6, 2021.

Li Kwai-wah, a senior superintendent at the national security department of the police force, leaves at the end of a media briefing after over 50 Hong Kong activists were arrested under the national security law, in Hong Kong, China January 6, 2021.

Pro-democracy activist Lester Shum is taken away by police officers after over 50 Hong Kong activists arrested under security law as crackdown intensifies, in Hong Kong, China January 6, 2021.

American lawyer John Clancey walks out of a building as he is taken away by police officers in Hong Kong, China January 6, 2021.

American lawyer John Clancey walks out of a building as he is taken away by police officers in Hong Kong, China January 6, 2021.

Li Kwai-wah, a senior superintendent at the national security department of the police force, attends a media briefing after over 50 Hong Kong activists were arrested under the national security law, in Hong Kong, China January 6, 2021.

Alan Leong, chairman of the Civic Party, attends a news conference after over 50 Hong Kong activists were arrested under the national security law, in Hong Kong, China January 6, 2021.

Pro-democracy activist Lester Shum is taken away by police officers after over 50 Hong Kong activists arrested under security law as crackdown intensifies, in Hong Kong, China January 6, 2021.

A supporter of pro-democracy activist Lester Shum waves to Shum as he is taken away by police officers after over 50 Hong Kong activists arrested under security law as crackdown intensifies, in Hong Kong, China January 6, 2021.

American lawyer John Clancey walks out of a building as he is taken away by police officers in Hong Kong, China January 6, 2021.

Pro-democracy activist Lester Shum is taken away by police officers after over 50 Hong Kong activists arrested under security law as crackdown intensifies, in Hong Kong, China January 6, 2021.

American lawyer John Clancey sits inside a police van as he is taken away by police officers in Hong Kong, China January 6, 2021.

Raphael Wong, chairman of the League of Social Democrats, attends a news conference after over 50 Hong Kong activists were arrested under the national security law, in Hong Kong, China January 6, 2021.

American lawyer John Clancey walks out of a building as he is taken away by police officers in Hong Kong, China January 6, 2021.

Pro-democracy activist Lester Shum is taken away by police officers after over 50 Hong Kong activists arrested under security law as crackdown intensifies, in Hong Kong, China January 6, 2021.

Li Kwai-wah, a senior superintendent at the national security department of the police force, attends a media briefing after over 50 Hong Kong activists were arrested under the national security law, in Hong Kong, China January 6, 2021.

Party members of the pro-democracy camp attend a news conference after over 50 Hong Kong activists were arrested under the national security law in Hong Kong, China January 6, 2021.