Toxic substance behind German fish die-off

Dead fish in the Oder River near Brieskow-Finkenheerd, Germany
It's not yet been known how many fish had died in the Oder River across Poland and Germany. -AP

An unidentified highly toxic substance in the Oder River, which runs through Poland and Germany, appears to be the cause of a mass die-off of fish in the waterway, officials from both counties say.

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