Two Chinese women take a photo with a cellphone beside the Yalu Bridge in Chinese border town of Dandong, northeastern Liaoning province, on April 10, 2013. A key border crossing between North Korea and China been closed to tourist groups, a Chinese official said on April 10 as nuclear tensions mounted, but business travel was allowed to continue.         AFP PHOTO / WANG ZHAO        (Photo credit should read WANG ZHAO/AFP/Getty Images)