Description:After one farmer admitted to dumping thousands of dead pigs into the river, Chinese officials now say he may not have been the only source. State media had said the 6,000 pig carcasses dredged from a river supplying tap water to Shanghai came from Jiaxing City, in the Zhejiang province But on Friday local Chinese officials said the pigs may not all come from Jiaxing. The city's deputy mayor said ear tagging on the pigs showed some of the carcasses originated from other areas.(0:56)