The junior bishop took over the Hong Kong diocese in 2002 and Pope Benedict XVI named him a cardinal in 2006, which he said signaled the pope’s focus on China. Zen retired from the Hong Kong post in 2009.
Also arrested Wednesday was singer-actress Denise Ho, who has become outspoken on a range of issues from the pro-democracy movement to LGBTQ rights.
Ho, a Canadian citizen, had earlier been banned in mainland China and lost her commercial endorsements after publicly supporting a 2014 push for expanded democratic rights known as the Umbrella Movement.
Ho was earlier arrested in December after police raided an independent online news site whose board she had formerly sat on, and charged her with conspiracy to publish a seditious publication.
Associated Press writer Kelvin Chan in London contributed to this report.
This article originally appeared here.