Six weeks after the start of Pakistan's devastating floods, waters pouring into a lake in southern Pakistan are threatening several towns and forcing tens of thousands of people to flee. Officials said, as floodwaters make their way to the Arabian Sea, new towns in Sindh province are being inundated as embankments constructed to protect cities and towns in the traditional flood plains are now channeling water into new areas, including Lake Manchar. Tens of thousands of people have fled towns in the Dadu district of Sindh, and officials said more were asked to leave after water, flowing from a breached embankment, reached a dangerous point in the lake, Pakistan's largest freshwater lake.