Two Moroccan men were taken off a Washington-bound flight from Paris after officials determined one was on the U.S. no-fly list.
Air France Flight 026 was diverted to Bangor on Saturday night, and the two men were being detained Sunday as officials investigated why the passenger had been allowed to board the plane in Paris.
The other man was traveling with the banned passenger.
"They are being detained and will be going through processing for expedited removal" from the country, said Janet Rapaport, spokeswoman for U.S. Customs and Border Protection.
Rapaport did not have the names or ages of the men, and did not know why one was on the no-fly list.
The plane eventually flew on to Dulles International Airport in Virginia, arriving more than two hours late.
Passengers, who were unaware of a problem until the plane crossed into U.S. air space, said everything went smoothly, though some were alarmed.
The plane, a Boeing 777, carried 263 passengers, an Air France spokeswoman said.