Swelled by torrential rains, the Yalu river that marks the Chinese-North Korean border breached its banks on both sides Saturday, inundating communities and forcing the evacuation of more than 50,000 people in China. Flood waters punctured a dike between the river and an economic development zone in a low-lying part of the Chinese port city of Dandong, Chinese state media reported. The rain and flooding cut rail service out of the city, destroyed more than 200 houses and left at least three people missing, in addition to the 51,000 evacuated to higher ground, local officials said.