In Bosnia and Serbia, days of torrential rains have triggered the worst floods to hit the region since records began 120 years ago.
More than two dozen people have died, said authorities, who warned the death toll could rise. Tens of thousands have fled their homes.
"We need everything, we are underwater," exclaimed Mico Micic, mayor of the eastern Bosnian town of Bijeljina, from which some 10,000 people were being evacuated.
Landslides triggered by the floods also raised the risk of injury or death from land mines left over from Bosnia's 1992-95 war. The landslides swept away many of the carefully placed warning signs around the minefields.