RIO DE JANEIRO - The US government spied on Brazilian state-run oil giant Petrobras, according to intelligence documents released Sunday by Globo television.
Globo said it obtained the information from Glenn Greenwald, a blogger and columnist for the Guardian newspaper, who got secret files from US National Security Agency leaker Edward Snowden.
No details were immediately available about the nature of the spying, other than that the information was based on documents dated June 2012.
Globo said it was unaware of the scope or objectives of the spying on Petrobras, which is the world's leader in deep-water oil exploration and has an annual turnover of 200 billion reais (about $90 billion).
A week ago, the network reported that the NSA had intercepted communication from Brazilian President Dilma Rousseff and from Mexican President Enrique Pena Nieto. That story was also based on information from Greenwald.
Rousseff, who is scheduled to visit Washington on October 23, warned that she would cancel the trip if she did not get convincing explanations from the Obama administration.
Obama has vowed to ease tensions with Rousseff and Pena Nieto, telling them in separate meetings at last week's G20 summit that he understood their reaction.
The US president has vowed to provide answers by Wednesday.