Hong Kong's national security police announced arrest warrants for 19 activists based overseas, accusing them of subversion under a stringent national security law, marking the largest such tally yet.

Hong Kong police have announced rewards for information leading to the arrest of 19 overseas-based activists, accusing them of violating a national security law imposed by Beijing.

The UK has condemned the latest cash offer from Hong Kong authorities for people who help in the arrest of pro-democracy activists living in Britain. In a joint statement, Foreign Secretary David Lammy and Home Secretary Yvette Cooper described the move as "another example of transnational repression".