https://apnews.com/502a8e0326164d0a959b864ac8c8f622

WARSAW, Poland (AP) — Authorities in Poland have banned swimming at over 50 Baltic Sea beaches after hot weather led to the toxic growth of bacteria in the unusually warm sea.

Emergency water rescuers are telling vacationers on the hot sandy beaches from Swinoujsce in the west to Gdynia in the east not to enter the sea, where thick green-brown cyanobacteria colonies have grown and pose a health threat.