A toxic spill is suspected but testing is yet to reveal the cause of the incident on the Oder river.
Officials in Poland and Germany are trying to work out the cause of a mass fish die-off along the Oder river, which runs between the two countries.
People have been told to avoid the river amid warnings of an environmental catastrophe from the German government. He explained that the problem had initially been assumed to be a "local" one - but it later revealed itself to be "very large" in scale.Mr Morawiecki suggested that "enormous quantities of chemical waste" had been dumped in the waterway, with no heed for the risks for wildlife.
But an official in Germany's eastern Brandenburg state said test results were showing increased levels of oxygen in the water, hinting at the presence of a foreign substance.
Ireland Latest News, Ireland Headlines
Similar News:You can also read news stories similar to this one that we have collected from other news sources.
Duffield weir removal to help salmon get to breeding groundThe concrete weir will be replaced with a ramp that fish can pass through.
Read more »
The science of drought explained in picturesWhat does drought mean and what are the implications for water, food, rivers and wildlife?
Read more »
Sewage leak blamed for illness in River Tweed swimmersSix children have become ill after swimming in the River Tweed earlier this week.
Read more »
Fans choice of Newcastle team v Brighton this afternoonNewcastle team v Brighton as selected by thousands of NUFC fans' votes.
Read more »