Nigeria has uncovered a spy cell run by militant Islamist group Boko Haram at the international airport in the capital Abuja apparently aimed at selecting targets for attack, the country's national security agency said.
Former national security adviser Mohammed Sambo Dasuki lost his job shortly after Nigerian President Muhammadu Buhari took office in May.
His visit comes after suspected Boko Haram militants ambushed a convoy carrying the country’s army chief.
The Nigeria Police Force has long been accused of widespread corruption in recent years including extortion, taking bribes and impunity.
In the latest spat between Nigeria's two main political factions, the former ruling Peoples Democratic Party accused the government of being "undemocratic."
Government property, including cars and houses, is still in the hands of advisers who served under ex-President Goodluck Jonathan.
The audit will cover accounts "all the way to 2014, 2015," including all contracts and agreements, managing director Emmanuel Kachikwu said.
A Senate committee will investigate the administrations of former leaders Jonathan, Yar'adua and Obasanjo over mismanaged funds.
While some see Eko Atlantic as Nigeria’s answer to climate change, critics say the government has long neglected extreme poverty and rural infrastructure.
The government failed to fully fund a light rail project and other ventures, leaving them unfinished or abandoned, Muhammadu Buhari said.
Nigeria holds some of the world's richest oil reserves and yet two-thirds of Nigerians still live in poverty and without access to grid electricity.
“In my opinion, the leadership and the structure of the church in Nigeria are as guilty as the politicians," Nigerian-born pastor Sunday Adelaja said.
The African nation's leader is expected to announce a deal with the violent terrorist group in the near future, a Nigerian news outlet reported.
Retired Col. Sambo Dasuki said the previous administration recaptured land from militants and stopped their leader from disrupting elections.
The move comes one day after the African nation's president appointed a new head of the Nigerian National Petroleum Corporation.
Appointing a petroleum minister is key to driving out graft in the African nation's oil sector, observers say.