AT least 31 people drowned at the weekend when a bus carrying a group of religious faithful was swept away by flood waters as the driver tried to cross a river in the eastern Kenyan county of Kitui, the county governor said. Many parts of the East African nation have been experiencing unusually heavy rainfall in the past week. At least 17 people were rescued after the bus was swept into the River Enziu, the governor, Charity Ngilu, said. "This afternoon tragedy has struck Kitui county," she wrote on Twitter, adding that rescue operations were being carried out by personnel…