More than 20 people have been killed in the worst floods in more than a century in Serbia and Bosnia.
A group is evacuated on an amphibious vehicle over flooded streets in the town of Obrenovac, Serbia, on May 17, 2014.
Landslides triggered by unprecedented rains in Bosnia have left hundreds of people homeless, while thousands more have fled their homes in neighboring Croatia and Serbia as Balkan countries battle the region's worst flooding since modern records began.
Children sit in a bus after being evacuated from the flooded town of Obrenovac, Serbia, on May 17.
Homes sit submerged due to overflowinh rivers in Doboj, a northern city of Bosnia and Herzegovina on May 16.
More than two dozen people have died, said authorities, who warned the death toll could rise.
Serbian army soldiers evacuate people from a flooded house in the town of Obrenovac, Serbia, on May 16. Rapidly rising rivers surged into homes, sometimes reaching up to the second floors, sending people climbing to rooftops for rescue.
People stand in their apartments as they wait to be evacuated in the flooded town of Obrenovac, Serbia, on May 17. Authorities said 25 people have died but warned the death toll could rise.
A group is evacuated on a boat over flooded streets in the town of Obrenovac, Serbia, on May 17.
Serbian army soldiers evacuate a boy from a flooded house in the town of Obrenovac, Serbia, on May 17.
A woman walks by a house destroyed by floods in the village of Krupanj, west from Belgrade, May 19.
A man climbs on the roof of a house to feed pigs they rescued during heavy floods in the village of Vojskova, Bosnia, on May 19.
People evacuated from flooded houses cross a bridge in the town of Obrenovac, Serbia, on May 17.
People are rescued from their flooded houses by boat in the village of Vidovice, Bosnia on May 18. Packed into buses, boats and helicopters, carrying nothing but a handful of belongings, tens of thousands fled their homes in Bosnia and Serbia, seeking to escape the worst flooding in a century.
Houses sit damaged from heavy rains in Sarajevo, Bosnia and Herzegovina on May 17. Throughout hilly Bosnia, floods are triggering landslides covering roads, homes and whole villages. About 300 landslides have been reported, and stranded villagers often are being rescued by helicopter.
Serbian army soldiers evacuate people in an amphibious vehicle in the flooded town of Obrenovac, Serbia, on May 17.
People help women out of a military truck during evacuation from Obrenovac, Serbia, on May 17.
A woman and her son move away from a European Union Force (EUFOR) helicopter after being rescued from the flooded Serici village near Zepce, Bosnia, on May 17.
People pass by damaged houses after flooding in Krupanj, Serbia, on May 18.
People build a dam made up of sandbags by the bank of the Sava river in Sremska Mitrovica, Serbia, on May 17, 2014 in Sremska, Serbia.
An evacuee from the Serbian town of Obrenovac holds a child in a shelter hall in Belgrade, on May 18. Two Russian cargo planes carrying food, generators and rescue boats landed in Serbia as part of a relief effort after the worst floods in over a century.
Evacuees from the Serbian town of Obrenovac lay on beds in a shelter hall in Belgrade, May 18.
— The Associated Press contributed to this report