Cleaning workers retrieve the carcasses of pigs from a branch of Huangpu River
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Over 2,000 dead pigs floating in Chinese river

11 March 2013 Last updated at 11:57 GMT

Over 2,000 dead pigs were found floating in a river near the eastern city of Shanghai.

No evidence has been found that the animals in the Huangpu river were dumped there or died of any animal epidemic, officials say.

The authorities are trying to establish where the animals came from, after they appeared in the river on Friday.

Officials are monitoring the quality of the water.

Martin Patience reports.