The United States announced sanctions on Friday against six Hong Kong or Chinese officials it blamed for implementing a new security law in Hong Kong, following the mass arrests of pro-democracy activists this month.

Hong Kong police arrested 53 people on Jan. 5 in the biggest crackdown on the democracy movement since China last year imposed a security law that opponents say is aimed at quashing dissent in the former British colony.

¡°This action by Hong Kong authorities is yet another stark example of Hong Kong¡¯s freedoms and democratic processes being fundamentally undermined,¡± U.S. Secretary of State Mike Pompeo said in a statement.