Nigeria’s new President Muhammadu Buhari this week appointed a committee to advise him on how to best tackle corruption that has crippled many sectors of the West African nation.

Buhari, a former military ruler of the country and the first ever opposition candidate to win a presidential election, had promised during campaigns ahead of the March vote that he would instill transparence in his government and clean up notoriously corrupt government.

The civil society says the Africa’s largest oil producing country has lost as much as $600 billion through corruption since 1999. The government over $150 billion of state funds was lost over the last decade.

Already two prominent politicians from the previous government have been detained and questioned over their involvement in grand level corruption, but so far no one has been convicted or arrested for fleecing the government.

“Whatever has come before us in facts and figures will be dealt with equally as required by the law. Nigerians should closely watch and follow what we’ve started or what we will continue to do. I’m sure they won’t find us wanting,” Lawal Daura, the head of Nigeria’s intelligence service, told Aljazeera in an interview.