Raging waters from three rivers have flooded large parts of the south-east German town of Passau following days of heavy rainfall in central Europe.
A spokesman for the city's crisis centre said the situation was "extremely dramatic" and waters are expected to rise further by midday to their level highest in 70 years.
Much of the city is reportedly only accessible by boat and there are power outages in some areas.
At least four people have reportedly died and nine are missing due to floods in Germany, Austria, Switzerland and the Czech Republic in recent days.
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Many central and eastern areas will start cloudy with some rain and hill fog.