Riot policemen stand against Belgrade students who trying to block a highway during a stand off in Belgrade October 3, 2000. Opposition protests were due to be stepped up on Tuesday and in the most serious stoppages, coal miners serving Serbia's two largest thermal power plants continued strikes started at the weekend. [Yugoslav President Slobodan Milosevic voiced defiance in a rare address to the nation on Monday, making clear he would not concede defeat and wanted a second round of voting after last month's presidential poll.]