Serbia and Bosnia call for international help to rescue people from flooded areas after the worst flooding since modern records began.
Waters are now beginning to recede, but officials say dangers remain.
They say that the threat of landslides is an ever-present problem as are the difficulties caused by unexploded landmines in Bosnia and river surges.
Serbia’s main power plant is still at risk of flooding. Tens of thousands of people have fled their homes.
Bosnian Refugee Minister Adil Osmanovic described the flooding as “catastrophic”.
Officials say that three months’ worth of rain has fallen on the Balkans in recent days, producing the worst floods since rainfall measurements began 120 years ago.
At least 35 people have died – with more casualties expected.
Serbia and Bosnia call for international help to rescue people from flooded areas after the worst flooding since modern records began
A large international aid operation is underway, with rescue helicopters from the European Union, US and Russia evacuating people from affected areas.
Serbian PM Aleksandar Vucic said Serbia now needed further help, particularly deliveries of food, clothing and bottled water.
The rain caused more than 2,000 landslides in hilly Bosnia, officials say, enveloping roads, homes and whole villages.
Rescuers are urging people to go to the balconies or rooftops of their houses with bright fabric to make themselves visible.
The north-eastern part of Bosnia is reported to be especially badly affected, with houses, roads and rail lines submerged.
Officials say that about a million people – more than a quarter of the country’s population – live in the worst-affected areas.
The floods and landslides have raised fears about the estimated one million land mines planted during Bosnia’s 1992-95 war.
Nearly 120,000 of the unexploded devices remain in more than 9,400 carefully marked minefields, officials say.
But the weather dislodged warning signs and in many cases loosened the mines themselves.
The flooding and landslide threat in Serbia is equally serious, made worse by the constant threat of surging river levels.
Residents spent the weekend piling up sandbags in riverside towns – including Belgrade.
Serbia’s state-run EPS power company said crews were doing all they could to prevent further damage to the Tesla power plant.
Parts of the plant and a nearby mine that provides its fuel were underwater. Damage to the mine alone is estimated at more than $137 million.
Serbian tennis player Novak Djokovic has joined calls for help.
“Support and solidarity for my people in Serbia!” he wrote on Twitter.
Large parts of eastern Croatia are also underwater, with villages still cut off and hundreds forced to escape the flooded zone in boats and trucks.
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Serbia’s main power plant is being threatened by the worst floods in the Balkans for decades, officials say.
The River Sava has burst its banks in many areas and water levels are expected to peak later on Sunday.
At least 20 people have died in Serbia and Bosnia-Herzegovina after a month’s worth of rain fell in three days, and the death toll is expected to rise.
In Bosnia, landslides have buried houses and disturbed landmines laid during the war in the 1990s.
The floods are also affecting Croatia.
The River Sava has burst its banks in many areas and water levels are expected to peak
In Serbia, thousands of residents in Obrenovac were moved to safety after much of the town was inundated.
The town, south-west of the capital Belgrade, is home to the Nikola Tesla power plant, which supplies much of the country.
Serbian PM Aleksandar Vucic said that his government’s primary concern was to protect the power plant.
“We are doing all we can,” he said.
Thousands of volunteers have responded to the government’s appeal to build up flood defenses along the Sava.
Serbian tennis player Novak Djokovic also appealed for help.
“Support for everyone! Let’s help those in danger! Join the aid action!” he wrote on his Twitter account.
Officials have refused to give a death toll for Obrenovac until the floodwaters recede.
Almost one-third of Bosnia is under water. The north-east is worst affected, with houses, roads and railway lines submerged.
Bosnian Serb police chief Gojko Vasic said the situation had been particularly difficult in Doboj “because the flood waters acted as a tsunami, three to four metres high”, the Reuters news agency reported.
Bosnian Security Ministry spokesman Admir Malagic said that about one million people – more than a quarter of the country’s population – live in the affected area.
Chairman of the Bosnian three-man presidency Bakir Izetbegovic said that his country is facing a “horrible catastrophe”, the Associated Press reported.
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More than 20 people are feared dead in Bosnia-Herzegovina and Serbia after the worst floods in more than a century.
Tens of thousands of people have fled their homes as several months of rain fell in a few days and rivers burst their banks.
Landslides have buried houses in Bosnia and reports say as many as 16 people may have died.
An outer suburb of the Serb capital Belgrade has been inundated and eight people are reported to have drowned.
Bosnia-Herzegovina and Serbia have been hit by the worst floods in more than a century
Serbian PM Aleksandar Vucic told reporters the first bodies had been recovered in Obrenovac, the worst-hit area to the south-west of the capital, and he feared more would be found.
But he said the number of deaths would not be made public until the waters had receded.
A new flood surge was expected on the Sava River late on Sunday, he said.
In some areas, flood waters reached the second floor of people’s homes.
“The flash floods woke my uncle at around 0330 so they went up to the first floor. Then they had to go to the third floor because all lower floors were flooded,” one resident from Obrenovac said.
Rescue workers have been working to bring thousands of stranded residents to safety and officials have also ordered the evacuation of another town, Baric, closer to Belgrade.
The Sava River has risen particularly high in the western town of Sabac, and volunteers have tried to shore up flood defenses there.
Rescue co-ordinator Predrag Maric appealed for food, water, and clothing to help those in need.
One of the worst-hit areas in Bosnia is the eastern town of Bijeljina where rescue teams are trying to transport 10,000 people to safety.
Among those who drowned were 10 people in the Bosnian Serb Republic, police told local media. Six bodies were found in the northern town of Doboj and there are fears that more people have lost their lives.
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