Brazil's Petrobras graft probe exapanded

Brazil's Supreme Court has approved an investigation into some of the country's top politicians.   They're accused of taking bribes in exchange for lucrative oil contracts from the state-run oil company, Petrobras.   Al Jazeera's Victoria Gatenby reports. More on our website: http://aljazeera.com Follow us on Twitter: http://twitter.com/AJEngligh Subscribe to our channel: http://bit.ly/AJSubscribe Find us on Facebook: http://facebook.com/aljazeera