HONG KONG, Jan 6 (Reuters) - Hong Kong's security secretary said on Wednesday the government will not tolerate "subversive" acts, hours after authorities arrested dozens of pro-democracy activists in a dawn swoop.

Secretary for Security John Lee, speaking at the city's Legislative Council, confirmed a group of people had been arrested in an operation targeting people suspected of "overthrowing" the city's government.

Earlier, authorities arrested prominent pro-democracy advocates tied to an unofficial, independently organised vote in July 2020 to select opposition candidates for a since-postponed legislative election. (Reporting By Clare Jim and Donny Kwok; Writing by Anne Marie Roantree; Editing by Jacqueline Wong)