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The Environment Agency​ are cleaning up what they suspect is old engine oil in the River Cole in Swindon.

They have traced the source to a surface water drain that discharges into the river.

They are working with Thames Water to establish how and when the oil got into the drainage system, which serves a large industrial and residential area of Swindon.

They'll continue to monitor the oil until it's gone.

They've taken samples at sections of the river but say it's not a water that they normally have to take samples of.