About 90 fish are thought to have been killed by pollution at a river in Okehampton, officials have said.
The Environment Agency (EA) said it had received reports of a chemical entering the River Lew, near Okehampton, late on Monday.
A spokesperson for the EA said samples had been taken from the river for analysis to help identify the source of the pollutant.
They added investigations were taking place and said once fish surveys had finished the total number of fish killed could be even higher.
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