Hong Kong police on Monday placed eight overseas-based pro-democracy activists on their wanted list on suspicion of violating the territory's national security law and offered rewards for information leading to their arrests.

The eight activists are all from Hong Kong and are currently living in countries such as Britain and Australia.

The national security law, which took effect three years ago, covers activities outside Hong Kong. Police said the charges against the activists include foreign collusion and inciting secession.

Pro-democracy activist Nathan Law was among the eight. He is accused of calling for sanctions on the governments in Beijing and Hong Kong during a foreign parliamentary hearing and media interviews.

Police offered rewards of one million Hong Kong dollars, or about 128,000 dollars, for information leading to each of their arrests.

It's quite rare for the Hong Kong police to reveal whom they have put on the wanted list as violators of the law.