A Southwest Airlines plane scheduled to leave Sea-Tac Airport for Denver was delayed Thursday, and federal authorities detained a passenger on board for questioning, the airport said.
Further details about what happened were unavailable.
Airport spokesman Peter McGraw told the Associated Press that the plane was never in danger, but did not further explain the security incident, which started about 12:30 p.m.
By about 2:30 p.m. the plane had been cleared, and the FBI and Port of Seattle police had detained the person for questioning, the airport said.
Passengers were to be rescreened at the terminal and put back on the plane to leave for Denver, officials said.