In an unprecedented incident, thousands of dead fish were found floating in a pond in Coimbatore on Tuesday, a police official said.
The incident in the Valankulam pond came to light when locals informed authorities in the city.
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Civic officials, who arrived to ascertain the cause for the death of the fish, said release of medical waste from hospitals and effluents
from dyeing units might have killed the fish.
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(With inputs from agencies)