(CNN) -- As if the deadly flooding inundating much of the Balkans wasn't alarming enough, rescuers must now grapple with another concern: the risk of landmines from the Bosnian war resurfacing.
"A vast number of landslides have worsened the situation and relief efforts," the Red Cross said, describing the rains as the "worst floods in more than a century."
The epic flooding is the worst Serbia has seen since the country began keeping records 120 years ago, meteorologists said.
Bosnian president on devestating floods
See devastation from severe flooding
Landslides destroying Bosnia-Herzegovina
"There are reports that landmines buried during the conflict and not yet removed are in some instances being shifted with the landslides, adding (to) the dangers of people living in the areas as well as rescuers," the Red Cross said.
"We cannot say exactly what happened with the mine fields," Bosnian President Bakir Izetbegovic told CNN's Christiane Amanpour. He warned that the mines were likely displaced in the flooding along with signs warning of mines in the area. "The system of the mine fields (was) under control, and had warnings marks are now actually removed," Izetbegovic said.
Floodwaters surround houses in Obrenovac, Serbia, on Monday, May 19. Heavy rainfall in Serbia and neighboring Bosnia-Herzegovina has resulted in the worst flooding the countries have seen since records began 120 years ago, meteorologists say.
Photos: Record flooding in Balkans
In the Serbian town of Obrenovac, at least 13 bodies have been recovered and officials in Bosnia-Herzegovina said 13 people had died there so far. Expert predict those numbers to rise as flood waters recede.
Even though the intense rainfall is subsided Monday, the disaster is far from over. CNN meteorologist Pedram Javaheri said flooding in the region will last at least another week -- and in some places, it could get worse.
The Serbian capital of Belgrade, for example, sits at the crux of the swollen Sava and Danube rivers. As water rushes downstream, the flood level in Belgrade is expected to rise through Thursday, Javaheri said.
The water has caused landslides throughout Bosnia.
"The landslides are absolutely destroying the country. We have registered up to 2,000," said Dr. Zlatko Lagumdzija, Bosina's minister of foreign affairs.
After a day of assessments, property damage alone is estimated a $1.37 billion (1 billion euros) said Elvir Camdzic, a presidential adviser.
"When combined with the overall economic losses due to the flooding, the full scale of the damage will be measured in billions of euros," Camdzic said.
'Happy that we didn't drown'
In Serbia alone, more than 24,000 people have evacuated to escape water that is chest-high in some areas. Bosian officials say 30,000 people are displaced in their country.
"People were in a panic, running," an evacuee told CNN affiliate N1 in Belgrade, Serbia. "I left with a kid. I was really happy that we didn't drown."
The woman's house is now flooded, and she says she has no idea where she will live.
But many Serbians wouldn't budge.
"Some people simply do not want to leave their homes," said Novica Biorac, a volunteer from a rafting club in Raska. "We are trying to convince them to leave, but it's very difficult."
Deadly situation
The Serbian government said at least 13 bodies have been found in the town of Obrenovac, about 35 kilometers (22 miles) from the capital of Belgrade. But one of the 13 was someone who had already died "of natural causes," Serbian Prime Minister Aleksandar Vucic said.
One of the deceased was a rescuer, said Dragan Radovanovic, president of the Serbian branch of the Red Cross.
Authorities estimate that 90% of Obrenovac has been flooded.
Serbia's not alone. In nearby Bosnia and Herzegovina, at least 13 people have died, Deputy Minister of Security Samir Agic said. The catastrophic weather has prompted authorities to declare a state of emergency in Bosnia and Herzegovina.
Bosnian authorities say the flooded town of Maglaj received the average rainfall for two months in less than two days.
"Many cities and villages in western Serbia are completely under water," the Serbian Embassy in Washington said in a statement Sunday, describing the situation as an "unimaginable catastrophe."
Fighting the flood
Soldiers, rescue workers and volunteers rushed to stack sandbags in towns near rivers throughout Serbia.
The Sava River has already reached 6.3 meters (20.7 feet) -- a historic high, the Serbian government said. The Prime Minister said workers have erected a dam 7.3 meters (24 feet) tall in the area of Sabac.
In Kostolac, along the Danube River, workers built sandbag walls to protect a thermal power plant -- one that the energy minister called the most important power facility in Serbia. The plant produces 20% of the nation's power.
The Prime Minister thanked countries that have already come to Serbia's aid. He said he was especially grateful to members of the Russian special forces, including one member who swam 200 meters (656 feet) in cold water to save several people.
CNN's Jo Shelley, Ralitsa Vassileva and Radina Gigova and contributed to this report.
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Police officers help an elderly women get out of a vehicle in Obrenovac on May 19.
People take shelter at a sports center in Odzak, Bosnia-Herzegovina, on May 19.
People walk past damaged houses in Krupanj, Serbia, on Sunday, May 18.
Residents place sandbags on a road near Orasje, Bosnia-Herzegovina, to protect the city from flooding on May 18.
An aerial photo shows the flooding in Brcko, Bosnia-Herzegovina, on May 18.
A woman walks past sandbags along the banks of the Sava River, in the Serbian city of Sremska Mitrovica on May 18.
Police officers help a villager evacuate his farm in anticipation of flooding in Sremska Raca, Serbia, on May 18.
A police vehicle drives through a flooded street in Obrenovac on May 18.
A rescuer carries an elderly woman out of her flooded house in Obrez, Serbia, on Saturday, May 17.
Residents ride in a wagon pulled by a tractor through a flooded field in the eastern Bosnian town of Bijeljina on May 17.
A Bosnian man looks through the doorway of his business in Banja Luka on May 17.
Bosnian men ride a tractor through flooded streets of Banja Luka on May 17.
Men paddle through the flooded streets of Obrenovac on Friday, May 16. Authorities estimate that 90% of the town has been flooded.
A member of the Bosnian army carries a boy rescued from his home May 16 in the town of Maglaj.
A woman tries to reach a trash container floating in the floodwaters in Obrenovac on May 16.
People flee their homes in Obrenovac on May 16.
A man walks outside his home after severe floods in Obrenovac on May 16.
Men empty buckets of water from a yard in Obrenovac on May 16.
A child smiles from a car window on a flooded street in a suburb of Belgrade, Serbia, on Thursday, May 15.
Homes are flooded May 15 after rivers overflowed in Sarajevo, Bosnia-Herzegovina.
A man works to divert a stream of water from his home near Zenica, Bosnia-Herzegovina, on May 15.
Landslide debris and floodwaters surround houses May 15 in the Bosnian village of Topcic Polje.
A man surveys the damage after a landslide near Sarajevo on May 15.
Floodwaters surround a car parked on a ramp Wednesday, May 14, in Doglodi, Bosnia-Herzegovina.
People work to clear debris from a small stream that was clogged and causing localized flooding near their homes in Tuzla, Bosnia-Herzegovina, on Sunday, May 12.
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