A firefighter died during a flood rescue in Austria and one person drowned in Poland, as torrential rain caused by Storm Boris continued to wreak havoc across Central and Eastern Europe.
In Romania, five people have died, while several remain unaccounted for in the Czech Republic.
The Austrian province surrounding Vienna has been declared a disaster area, with its leaders speaking of "an unprecedented extreme situation".
Poland's prime minister Donald Tusk declared a state of natural disaster.
Some of the worst rainfall has been in the Czech Republic, where some areas have seen around three months’ rainfall in just three days.
Evacuations are under way and four people remain missing - three in a car which disappeared into a river in North Moravia, and one man who was swept into a flooded stream in South Moravia.
Marek Joch, a resident of Lipov in the southeast, said the town was "closed from all sides" and the "next wave" of the flood is still to come.
"Now everyone is trying to clean up as quickly as possible to prevent further large spills from the river. Unfortunately, no one knows when the water will recede.
"We still have to survive until Tuesday, this is not the end.”
Jesenik, a town located in the Jeseniky mountains, is described as completely cut off, with roads and rail lines underwater.
Around 17,000 people in the Kłodzko area alone are without power, and internet and mobile telephone connections are down.
Several dozen police and firefighters in Prague were called to rescue a man who went swimming in the flooded Vltava at 7am on Sunday.
On Saturday, police in North Moravia were called after three men were spotted wading into the flooded River Odra on paddleboards.
The mayor of Slobozia Conachi, a village in Romania's south-eastern Galati region, said 700 homes had been flooded.
"This is a catastrophe of epic proportions," Emil Dragomir said.
Four people were killed in Galati on Saturday, with a fifth death confirmed on Sunday.
In Austria, governor Johanna Mikl-Leitner said a firefighter had died while pumping out a flooded cellar.
She said the whole of the Lower Austria province has been declared a catastrophe zone.
Multiple trains have been cancelled, parts of the Vienna underground have been closed, and at least one motorway has flooded.
In a post on X, Austria‘s Chancellor Karl Nehammer said the storm situation had "worsened" and was "very serious." EPA
In Glucholazy, southern Poland, firefighters have been building sandbag barriers to protect residents near the river
In the Polish town of Stonie Slaski, a dam has been breached, releasing a torrent of water that has destroyed at least one house, the Institute of Meteorology and Water Management said.
In the same town a bridge collapsed, funnelling water through the streets.
"Soldiers supporting the local population are cut off from their land route back," the Polish Ministry of Defence said.
"Many residents have to be evacuated from the roofs of their homes.”
In Glucholazy, in the southwest, the mayor of the town said the local river had overflowed its banks and was flooding the town.
A resident of the town, Zofia Owsiaka, said everyone was "scared" and there seemed to be "no hope of the rain stopping".
In Krakow, Poland's second largest city, residents have been offered sandbags for flood protection.
Speaking from the town of Klodzko, one of the worst-affected areas, Tusk said 1600 people in the district had been evacuated.
A total of 17,000 people in the area are without power, he said, and in parts Starlink satellites links are being used to maintain mobile phone signal and internet connections.
He added that a helicopter had been sent to help with rescue efforts in regional capital Wroclaw.
On Sunday, the mayor of Klodzko announced that his town had "lost the battle" against the floods, and that the situation had become "critical".
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