Authorities were alerted to Oyewole's alleged double life when the Port Authority of New York and New Jersey's inspector general's office in Hoboken received an anonymous letter, the officials said. The letter described Oyewole's using additional names, though those weren't divulged Tuesday.

The Port Authority, which operates the area's main airports and other transit hubs, said Oyewole entered the United States illegally in 1989 and had worked under several contractors at the airport, most recently FJC Security Services, and supervised about 30 guards. The agency said its investigation found no indication that he used the fake identity for any reason other than to live in the United States.

An FJC spokesman said Monday that Oyewole didn't have access to employees' personal information in his position as tour supervisor.

Potentially more problematic from a security standpoint, Oyewole had access to sensitive areas of the airport, including the tarmac and the planes themselves.