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It is feared more than a thousand fish have been killed in a polluted river at Horley, Surrey. Ammonia has been found in 4km of Gatwick Stream - a tributary of River Mole. Already 763 dead fish have been recovered. Dave Webb, fisheries team leader at the Environment Agency, tells Â鶹Éç Surrey he thinks someone may have put the chemical down a drain and did not realise the problem.