Yuanjun Tang, now an American citizen, is alleged to have spied on US-based Chinese democracy activists.

Pro-democracy activist Chow Hang Tung was among those arrested over alleged social media posts.

The photo, showing the combination of numbers 6 and 4 , has been scrubbed on Chinese social media.

Pro-democracy activists have been detained in a crackdown on marking the 1989 massacre in Beijing.

Jiang Yanyong became a national hero after revealing Beijing was covering up the scale of the virus.

A court finds the police ban was not lawful but Chow Hang-tung stays in custody on separate charges.

Driven to breaking point by zero Covid, educated young Chinese are questioning the Communist Party's rule.

Jiang's death comes at an uncertain moment for China amid its most serious protests since Tiananmen.