United Airlines spokeswoman Megan McCarthy said Monday that she did not have any information on what was said but confirmed that the passengers exited the aircraft.
The incident occurred on a United Airlines flight bound for Tampa, Fla., from Dulles, McCarthy said.
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Airport police spoke with crew members, but none of the passengers were detained, said spokeswoman Courtney Mickalonis of the Metropolitan Washington Airports Authority.
The nine passengers were re-booked on a Monday flight, McCarthy said.