Parts of Austria, Czech Republic, Hungary, Poland, Romania and Slovakia were flooded over the weekend as Storm Boris unleashed record-breaking rainfall. It comes after Europe’s hottest summer on record and unprecedented heat in the Mediterranean and Black Sea, which scientists say fuelled the storm.

Parts of central and eastern Europe are experiencing some of the worst flooding events in modern history, which over the weekend killed at least eight people and displaced tens of thousands across several countries.

As of Sunday night, eight casualties were reported in central Europe over the past two days, according to Reuters, including one firefighter in Lower Austria. Authorities on Sunday declared the area – the country’s largest and second-most-populous state bordering Vienna – a disaster zone.

In the capital Vienna, Wien River banks were partially flooded on Sunday as waters rose from 50 centimeters to 2.26 meters in the course of a day. Three districts lost electricity and two subway lines were partially closed.