Emergency workers in Serbia are preparing for a "flood wave" on one of the country's main rivers - the Sava.

It comes after the worst floods in the Balkans for decades left more than 35 dead and forced tens of thousands of people to flee their homes.

Serbian Grand Slam tennis champion, Novak Djokovic, who has just won his third Italian Open title in Rome, told the BBC it had been ''very emotional'' to see the suffering in his country.