LA PAZ, Bolivia — An elections court threw a new wrinkle into Bolivia’s bitterly disputed presidential election on Thursday, ordering a revote in four places because irregularities.

The ruling from the Supreme Electoral Court further delayed final results for the election, which was held last Sunday.

Early returns suggests that President Evo Morales did not secure enough votes to avoid a runoff, but in the days that followed, he insisted that he had.

Supporters of his opponent, Carlos Mesa, have accused the government of rigging the election results, and authorities from outside the country have also raised concerns.