"If they wanted to hear from me, they only had to call and I would have gone, because I owe nothing to anyone and fear nothing," Lula said after the interrogation, quoted by BBC.
Lula, who was in power from 2003 to 2010, is said to have benefited from the kick-back scheme, which helped the ex-president become the owner of luxurious real estate objects.
Brazil-based Petrobras company was involved in a corruption scandal last year, after it was revealed that several functionaries signed contracts and received for that a 3-percent commission of the contract amount. These funds were further used to bribe politicians and officials. According to the Brazilian authorities, overpricing and bribery brought to the masterminds about $3.8 billion.