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Joao Vaccari Neto. Image courtesy of Roosewelt Pinheiro/Wikimedia Commons.

Brazilian police questioned the treasurer of the country’s governing Workers Party Wednesday as part of an ongoing probe into alleged corruption at state owned Petrobras.

Party Treasurer Joao Vaccari Neto was not arrested but he was taken to a police station to make a statement, the BBC said.

Prosecutors said they asked Neto about legal and illegal donations he may have solicited from Petrobras contract holders.

Eighteen other people were also brought in for questioning, Bloomberg said.

CEO Maria das Graças Foster resigned from her post Wednesday long with CFO and chief investor relations officer Almir Guilherme Barbassa, upstream director José Miranda Formigli, downstream director José Carlos Cosenza, gas and power director José Alcides Santoro and engineering, technology and procurement director José Antônio de Figueiredo.

Petrobras’ board of directors will meet Friday to name replacements for the resigning executives.

Foster has not been implicated in the scandal and has maintained that she was not aware of the activity until police launched a probe into the company.

In September, former Petrobras executive Paulo Roberto Costa admitted to taking a $636,000 bribe in connection with the company’s 2006 purchase of a Texas refinery.

Costa alleges executives were skimming as much as 3 percent off the price of contracts and giving the money to political organizations, including campaigns run by transportation chief and politician Sergio Machado.

Machado has denied any wrongdoing.

The U.S. Department of Justice and the U.S. Securities and Exchange Commission have also reportedly opened up investigations into the company although the two agencies have not commented on the mater.

The scale of the corruption is still unknown although Brazilian authorities have claimed kickback and bribery schemes could have diverted anywhere between $3.7 billion to $28 billion from the company.