BBC visits Brazil polling station as ballots cast
More than 142 million Brazilians are voting to choose the country's next president, following a dramatic election campaign.
Early on, incumbent Dilma Rousseff had been expected to win outright.
However, the death of one of the main candidates and the popularity of his replacement, environmentalist Marina Silva, means the vote is now likely go to a second round.
The BBC's Wyre Davies visited a polling station in Rio de Janeiro.