Jakarta | Five days before Indonesians go to the polls a video has surfaced purporting to show ballot papers being marked in favour of President Joko Widodo, adding new tension to an election already marred by allegations of vote rigging and fraud.

In a country where social media dominates the political discourse the viral video, the source of which has not been authenticated, may help challenger Prabowo Subianto, who has already threatened to contest the legitimacy of the result.