More than one-hundred-thousand people have been attending a rally in Belgrade against President Slobodan Milosevic of Yugoslavia.
Organisers demanded Mr Milosevic's resignation within two weeks.
In a dramatic development, the controversial opposition leader, Vuk Draskovic, addressed the rally despite having earlier withdrawn as a speaker.
The BBC Belgrade correspondent says the mood was electric, with the protestors chanting, 'We want Vuk'.
But in a sign of continuing opposition splits, Mr Draskovic's speech was sometimes drowned by boos.
The Belgrade rally was the culmination of a series around the country.
President Milosevic's Socialist Party earlier revealed plans for early general elections, in an apparent move to diminish support for the opposition.
From the newsroom of the BBC World Service