The United States, Israel, Turkey, Slovenia, Austria, Luxembourg and Croatia have offered aid to Balkan states suffering their worst floods in 120 years.<br/> <br />Croatia has some flooding itself in the east but the town of Obrenovac in Serbia is the hardest-hit.<br/> <br />It's likely the region's entire population of 25, 000 will be evacuated.<br/> <br />Bosnia's also appealing for international help to handle the floods.<br/> <br />Here too tens of thousands face the prospect of evacuation<br/> <br />By Sunday at least 20 people were known to have died, nearly all in Bosnia.<br/> <br />In eastern Croatia about 1, 000 troops have been deployed to help with relief effort in flooded areas.<br/> <br />Forecasters were warning of surges of high water expected to reach the Sava and Danube rivers over the weekend, threatening thousands more properties and roads.<br/> <br />What's being described as three months of rainfall in just three days also threatens further dangers.<br/> <br />It's a mountainous regions and many hillsides ha
