TIMELINE-Main events in Brazil corruption probe
March 4 (Reuters) - Former Brazilian President Luiz Inacio Lula da Silva was briefly detained for questioning on Friday in a two-year-long probe of a vast corruption scheme involving state oil company Petroleo Brasileiro SA, or Petrobras , a political crisis that threatens his successor, President Dilma Rousseff.
The following are some of the main events in the investigation:
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 car by convicted black market money changer Alberto Youssef.
Aug. 22, 2014
Costa signs a plea bargain deal with prosecutors, agreeing to explain the corruption scheme and name beneficiaries in exchange for a lighter sentence. Plea bargains become a cornerstone of the investigation.