Anti-corruption protesters in Serbia set fire to the Valjevo offices of the country's ruling political party, city leaders said, amid clashes sparked by the deadly collapse of a rail station in November.

Russia's foreign ministry shores up the beleaguered president, saying it won't 'remain unresponsive' to Serbia's protests.

Police threw multiple rounds of tear gas and charged at the demonstrators who hurled bottles, rocks and flares at them.