The fight against corruption is the single most important thing we have to do.

Zainab Shamsuna Ahmed,executive secretary of the Nigeria Extractive Industries Transparency Initiative (NEITI)

Attempts to rein in corruption in Nigeria's oil industry are reportedly falling short, leaving many Nigerians asking where most of the wealth has gone.

The country's newly-elected President, Muhammadu Buhari, has pledged to fight corruption and is investigating claims by the former head of the Central Bank that $20bn of oil revenue went missing from the state oil company.

A report by accounting firm PricewaterhouseCoopers says the national oil company should refund $4.3bn to the government.

But it is not just the oil industry that is plagued by graft.

On a recent visit to Washington, Buhari sought US President Barack Obama's help in retrieving $150bn stolen by corrupt former officials and held in foreign bank accounts.

Zainab Shamsuna Ahmed, the executive secretary of the Nigeria Extractive Industries Transparency Initiative (NEITI), joins the programme to talk about Buhari's efforts to fight corruption.

Source: Al Jazeera