TIMELINE-Key moments in Brazil's Petrobras corruption probe
June 23 (Reuters) - Prosecutors and federal police in Brazil unearthed the country's largest-ever corruption scandal by tying a ring of black-market money changers to a price-fixing and political kickback scheme at state-run oil firm Petrobras .
Executives from two dozen top engineering firms are accused of inflating the value of service contracts and funneling the excess funds into their own bank accounts and to political parties, including President Dilma Rousseff's Workers' Party.
The investigation is likely to continue for at least two more years and may widen to include the country's biggest electric utility, Eletrobras, a lead prosecutor on the case told Reuters on Tuesday.
Here are some key moments of the investigation, which has ensnared Brazil's most powerful executives and politicians:
March 20, 2014
Federal police arrest the former head of Petrobras' refining and supply department Paulo Roberto Costa, the result of an investigation that started when they noticed Costa had been given a Range Rover by convicted money changer Alberto Youssef.
Aug 22, 2014 Continuación...