Romania's main opposition candidate has called for a repeat of Sunday's first round of presidential and parliamentary elections, alleging widespread electoral fraud.

Among other allegations, centrist coalition leader Traian Basescu said Tuesday the ruling Social Democrats chartered dozens of buses to allow supporters to go from precinct to precinct and cast ballots several times.

With 90 percent of the votes counted, Prime Minister Adrian Nastase and his Social Democrats lead Mr. Basescu's centrist alliance 36 percent to 31 percent in the parliamentary election. The presidential election tally has Mr. Nastase ahead of Mr. Basescu 40 to 34 percent.

The two candidates are scheduled to face each other in a runoff election on December 12.

Pro Democratia, a Romanian civil rights group, says it will pull its election monitors from the second round of voting to protest reported irregularities.

Some information for this report\ provided by Reuters and AP.