People ride on tractor in a flooded street in Obrenovac, some 30 kilometers (18 miles) southwest of Belgrade, Serbia, Monday, May 19, 2014. Belgrade braced for a river surge Monday that threatened to inundate Serbia's main power plant and cause major power cuts in the crisis-stricken country as the Balkans struggle with the consequences of the worst flooding in southeastern Europe in more than a century. At least 35 people have died in Serbia and Bosnia in the five days of flooding caused by unprecedented torrential rain, laying waste to entire towns and villages and sending tens of thousands of people out of their homes, authorities said. (AP Photo/Darko Vojinovic)