Brazilian investigators believe 6.19 billion reais ($2.1 billion) in bribes were moved in a corruption scheme involving state-run oil firm Petroleo Brasileiro SA (PETR4.SA), prosecutor Deltan Dallagnol said on Thursday. Prosecutors seek to restore 6.77 billion reais to public coffers through fines and the return of stolen funds, he said at a televised press conference to present criminal charges against 13 people, including four former congressmen. One is from the ruling Workers’ Party and the other three belong to the smaller opposition Party of Solidarity.