The Swiss attorney general’s office has confirmed that it is helping Oman investigate alleged corruption in the country’s national oil company and oil ministry, announced swissinfo.ch.

In an email message to swissinfo.ch, the Office of the Attorney General wrote that “In connection with these corruption investigations the Office of the Attorney General of Switzerland (OAG) is granting judicial mutual assistance to the authorities of the Oman. The cooperation is working very well.”

Previously an Omani state oil company’s CEO was sentenced to 23 years in jail for taking bribes, abuse of office and money laundering.

Omani authorities have been cracking down on corruption and graft in the oil sector since the Arab Spring began in 2011 and this is just the latest example.

Transactions related to the probe involved Swiss financial institutions, sources told Reuters, just as Swiss authorities had been working with their counterparts in Brazil investigating the Petrobras scandal, along with Odebrecht SA, Latin America’s largest engineering and construction company, and its subsidiaries.