The Oder River Poisoning: What Is Killing Hundreds Of Tons Of Fish

Mystery toxin suspected as 100 tons of dead fish removed from Oder

Oder river report - European Commission

Poland pulls 100 tonnes of dead fish from Oder river after mystery

Fear for future after mass die-off of fish in Poland's Oder river

Photos: Mystery surrounds mass fish deaths in the Oder River

Thousands of fish killed as water polluted in rivers at

Synthetic chemical' substance blamed for mass death of fish in Oder

Could a mass fish die-off in the Oder River happen again? – DW

Oder river: Mystery surrounds thousands of fish deaths

What killed tons of fish in European river? Mystery deepens

Oder river: Mystery surrounds thousands of fish deaths