Brazilian energy giant Petrobras is being investigated for alleged corruption in one of the worst scandals in the company's history. 

Leaked documents purported to show wide-scale bribes being paid by at least one top executive. Some claim the scandal is all politically motivated to harm President Dilma Rousseff’s re-election chances.
 
Al Jazeera's Gabriel Elizondo reports from Brasilia.

Source: Al Jazeera