Hong Kong police arrested prominent democracy activist Joshua Wong on Thursday for participating in an unauthorised assembly in October 2019 and violating the city's anti-mask law, according to a post on his official Twitter account.

Wong's latest arrest adds to several unlawful assembly charges or suspected offences he and other activists are facing related to last year's pro-democracy protests, which prompted Beijing to impose a sweeping national security law on June 30.

Hong Kong police confirmed they arrested two men, aged 23 and 74, on Thursday for illegal assembly on Oct. 5, 2019.