BELGRADE, Yugoslavia - The Yugoslav constitutional court on Wednesday annulled parts of the contested presidential election in which the opposition claims President Slobodan Milosevic was defeated, the state-run Tanjug news agency said.
The statement indicated that the results of other races for parliament and local councils would be considered valid.
The announcement came on the eve of a planned mass rally in Belgrade which the opposition hoped would be the final push to force Milosevic to concede defeat to challenger Vojislav Kostunica.
Milosevic's acknowledged Kostunica finished first in a five-candidate field but without a majority needed to avoid a runoff Sunday. The opposition has rejected a runoff.
Opposition official Goran Svilanovic said he believes the opposition will also not agree to take part in a rerun of the first round.
"We have our elected president," he said. "These are things we can discuss, but my initial reaction is that there can be no bargaining."