Cleaning workers retrieve the carcasses of pigs
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China pulls nearly 6,000 dead pigs from Shanghai river

13 March 2013 Last updated at 11:09 GMT

The number of dead pigs found floating in Shanghai's main river has risen to almost 6,000.

The city authorities, still investigating where they have come from, say a number of the carcasses have tested positive for a common pig virus.

John Sudworth reports from Shanghai.