Serb nationalists have clashed with police in Belgrade after speeches by right-wing politicians and other figures at a rally in support of former Bosnian-Serb leader, Radovan Karadzic.
Police fired rubber bullets and tear gas at protesters, who threw stones, flares and fireworks.
A number of protesters and policemen were reported hurt in the violence.
Earlier, an estimated 15,000 people gathered in Belgrade's main square for the rally organised by Serbia's Radical Party.
The demonstration showed the anger and frustration of a hard core of Serb nationalists.
The protesters showed their support for Mr Karadzic, who is expected to be sent to the war crimes tribunal in The Hague soon. He was arrested a week ago after 13 years on the run.
Mr Karadzic faces 11 charges, including genocide and crimes against humanity during the war in Bosnia in the 1990s.