Former Brazilian President Luiz Inacio Lula da Silva is angry over a prosecutor saying a luxury apartment that he once thought of buying could be part of a scheme to launder money from the corruption scandal buffeting state-owned oil company Petrobras.

The Sao Paulo-based Lula Institute says on its website that Silva repudiates any attempt to involve his name in illicit acts. Silva has said his wife had an option to buy the apartment in the coastal city of Guaruja but they never purchased it.

On Wednesday, prosecutors said they were investigating whether money diverted from the Petrobras scheme was laundered through illegal real-estate transactions.

Prosecutors have alleged that over $2 billion was paid in bribes by businessmen to obtain Petrobras contracts.