FILE - In this Sept. 9, 2017, file photo, visitors walk across the Yalu River Broken Bridge, right, next to the Friendship Bridge connecting China and North Korea in Dandong in northeastern China's Liaoning province. China on Friday, April 29, 2022, said it halted railroad freight traffic with North Korea in Dandong as it deals with the spread of COVID-19 in the border town. (AP Photo/Emily Wang, File)