The dumping of large quantities of detergent has been blamed for a pollution alert which killed thousands of fish in a Teesside river.
The Environment Agency said thousands of stone loach, minnows and hundreds of trout were affected.
The river has now been given a clean bill of health after an investigation into last week's incident at the River Tame, near Stokesley.
The Environment Agency is still trying to find out who was responsible.
A stretch of the river and its tributary, Main Stell, near Stokesley, south of Middlesbrough, was affected.
The pollutant was odourless and almost colourless. At one point members of the public were warned to stay away.
The agency said it had traced the pollution to inlets at nearby Newton Under Roseberry.
Heavy rain at the weekend helped flush the detergent away and officials remain confident that no more has entered the river.