 Several tons of fish have died along one of the main rivers in Brazil's Sao Paulo state after an alleged illegal dumping of industrial waste from a sugar and ethanol plant. Environmental authorities and prosecutors said Wednesday that a preliminary analysis estimates that between 10 and 20 tons of fish died on the Piracicaba River in southeastern Brazil. The initial investigation points to an irregular discharge of wastewater from a Stiva Sao Jose plant in the community of Rio das Pedras, and it reached a stream that flows into the river, according to prosecutors.