Rescue workers in Taiwan battled through thick mud on Friday, looking for seven people still missing after Super Typhoon Ragasa this week sent a wall of water into a small town on the east coast. The number killed in the flooding rose by one to 15, the fire department said. Heavy rain in Hualien county caused a so-called barrier lake in the mountains to overflow on Tuesday, releasing a thick sludge of water and mud on the town of Guangfu. While the flood waters have receded, large parts of the area remain covered in dark grey mud, creating problems for residents and rescuers alike. Rescue workers, sometimes wading in mud up to their waists, have been cutting holes in building...