Chinese officials say more than a thousand dead pigs have been fished out of Shanghai's main waterway.
The city's Agriculture Committee said Saturday they have found no evidence that the swine were dumped in the Huangpu river in Zheiiang province, nor any evidence of disease. However, some reports say the carcasses were likely dumped upriver.
The city government also said Monday that workers continue to pull carcasses out of the water. Officials are investigating the incident.
Shanghai said it is testing water samples from the river, but so far has found no pollution.
Water contamination caused by fertilizer runoff, chemical spills and untreated sewage is a major problem in China.