Mr Epowei Charles, the Area Comptroller, Murtala Muhammed International Airport (MMI) Customs Command, said on Tuesday that it has arrested a passenger, Onwuekwe Chidi, with over US $320,000.
Charles made the revelation in a news statement made available to the News Agency of Nigeria (NAN) in Lagos.
He said that Chidi was arrested aboard a Qatar Airways flight bound for Doha, in the Gulf region.
The Comptroller said that Chidi declared the money but could not explain the source of the currency or show adequate proof of his business to customs officials.
"The passenger and the money had been handed over to officials of Economic and Financial Crimes Commission (EFCC), for further investigations," Charles said.
"At about 1300 hours on November 19, 2012, a passenger by name Onwuekwe Anthony Chidi, with passport number A04086671 was checking in on Qatar Airways.
"He declared US $320,000 on both forms CDFIA and CDFIB but he could not explain the source of the currency nor show adequate prove of his business to the customs officer at the currency desk at the 'E' wing departure hall of the airport."