A second suspected pollution outbreak has killed around 100 fish in an Oxfordshire brook.
The Environment Agency is investigating the deaths of stickleback and trout discovered at Ginge Brook in Drayton, near Abingdon, on Sunday.
Last Thursday another 100 fish were found dead floating on the surface of Shill Brook near Carterton.
Experts do not believe the two cases are linked.
Senior Environment Officer Steve Wilkes said chemicals escaped into the brook but the believed source of the pollution has been stopped.
Farmers have been advised to prevent livestock from drinking directly from the Ginge Brook or River Thames between Culham and Appleford for the next couple of days.
Public health is not believed to be at risk but the Health Protection Agency has been informed.
Anyone sees dead fish or pollution should ring Environment Agency hotline on 0800 807060.
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