The Brazilian national flag flutters at the front of the headquarters of the Brazilian state oil giant Petrobras, in Rio de Janeiro, Brazil, on March 13, 2015. The corruption scandal enveloping Brazilian state oil giant Petrobras deepened Thursday when prosecutors said they will investigate three members of the ruling coalition, including the governor of Rio de Janeiro state. Dozens of political figures and former Petrobras executives are under suspicion over a scheme facilitating corruption and money laundering that saw an estimated $3.8 billion creamed off inflated contracts over a decade, though nobody has yet been convicted.   AFP PHOTO / VANDERLEI ALMEIDA        (Photo credit should read VANDERLEI ALMEIDA/AFP/Getty Images)