People visit the annual book fair in Hong Kong Wednesday, July 14, 2021. Booksellers at Hong Kong's annual book fair are offering a reduced selection of books deemed politically sensitive, as they try to avoid violating a sweeping national security law imposed on the city last year. (AP Photo/Matthew Cheng) world U.S. warns companies about doing business in Hong Kong Today 04:11 am JST Today | 06:49 am JST WASHINGTON The Biden administration issued a blanket warning Friday to U.S. firms about the risks of doing business in Hong Kong as China continues to clamp down on political and economic freedoms in the territory.