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".

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.