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TULSA, Okla. (AP) — A Delta Air Lines flight from Portland, Oregon, to Atlanta was diverted to Tulsa, Oklahoma, on Wednesday because of an onboard disturbance involving a passenger, and a U.S. attorney said his office will determine whether that passenger violated federal law.

Tulsa International Airport spokeswoman Alexis Higgins said Delta flight 1156 landed about 11:30 a.m. and that the passenger was removed to be questioned by the FBI. It’s unclear what the passenger did. Higgins said she did not know the nature of the disturbance.

Tulsa-based U.S. Attorney R. Trent Shores said in a statement that federal air marshals who were flying on the plane “de-escalated and controlled the situation” and that the aircraft landed without further incident. Shores said federal prosecutors will review the FBI’s investigation to determine whether to pursue charges.

Delta said in a statement that the flight was diverted because of an “unruly passenger” and apologized to other customers who were inconvenienced because of the delay. Delta spokesman Anthony Black said 172 passengers and six crew members were on board the Boeing 737-900.

Social media users complimented Delta staff but did not give details about the disturbance.

Black said the flight landed in Atlanta around 4:30 p.m.