Polling stations open across Brazil as President Luiz Inacio Lula da Silva casts his vote in Sao Paulo in the country's general election on Sunday, October 4.

Lula is seeking a fourth non-consecutive term in a closely contested presidential race, with Senator Flavio Bolsonaro, the eldest son of former President Jair Bolsonaro, his main challenger.

The Workers' Party candidate is campaigning on strengthening workers' rights, raising living standards and expanding social programmes, including a pledge to reduce the working week to 40 hours without cutting salaries.

Nearly 159 million Brazilians are eligible to vote for a president, governors, senators and federal and state lawmakers. If no presidential candidate wins more than 50 percent of valid votes, the two leading candidates advance to a runoff on October 25.