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.