An investigation has begun into how gallons of oil leaked into a river in the centre of Reading, harming dozens of swans.
A three and a half mile stretch of the River Kennet was affected and experts say it could take weeks to clean up.
The Environment Agency is working with police and says the substance is believed to have leaked from a nearby industrial site.
As Mel Bloor reports.
Mel spoke to Dorothy Beeson from the Swan Sanctuary and David Mc Knight from the Environment Agency.