Brazilian President Lula's campaign team has filed a petition with Brazil's Superior Electoral Court, seeking to disqualify his right-wing rival, Flávio Bolsonaro, from the election, citing alleged election interference by social media company Meta.

Lula accuses Meta of restricting his campaign content to boost Bolsonaro's campaign. Bolsonaro, in turn, has countersued Lula for allegedly abusing government posts for mass dissemination on WhatsApp. UN experts have also expressed concern about the disparity in reach for various campaign teams on Meta platforms during elections.

Meta denies favoring any party and states it will comply with court orders to ensure fair competition. The second round of Brazil's presidential election will be held this Sunday.

Reported by BBC World News.