Mass protest in Rio over the distribution of oil royalties
27 November 2012 Last updated at 15:27 GMT
An estimated 200,000 people have taken to the streets of Rio de Janeiro to ask Brazil's President Dilma Rousseff to veto a bill that proposes sharing oil revenues more evenly between oil-producing states.
Opponents of the bill say it will deprive Rio state of up to $35bn (£22bn; 27bn euros) over the next eight years and that this could jeopardize Rio's ability to host the 2014 World Cup and the Olympics in 2016.
Iracema Sodre reports.