you know, the reporter aaron telson joins me now from frankfurt. oda, authorities think it's a key. so poisoning, but others are blaming climate change. do we know for certain why all these fish have died? okay, one standing i'm sorry im standing here on the banks of the odor in between germany and poland and for weeks now. and people who've been living around the river happened pulling tons of dead fish from the waters. now. initially, people thought that it was actually caused by the extreme heat and drought that germany's been facing the last several weeks. but now it seems that investigators are a little bit closer to figuring out exactly what is behind is massive fish die on a die off. basically, it looks like there's been some type of release of some type of caustic or on poisonous chemical from a factory in poland. now we know that polish authorities actually detected the leak sometime back in july, but for some reason, they didn't notify german authorities in europe, find their own population that they should avoid the waters in and around the odor . but they didn't notify t