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.

Police said in a statement Friday that the group, Hong Kong Parliament, aimed to promote self-determination and establish a so-called “Hong Kong constitution,” alleging it was using illegal means to overthrow and undermine China’s fundamental system or overthrow the institutions in power in the city or China.

HONG KONG — Hong Kong police have announced rewards for information leading to the arrest of 19 overseas-based activists — including people who live in Canada — for their roles in what they called a subversive organization abroad, accusing them of violating a national security law imposed by Beijing.