A U.S. passenger airliner with 231 people...

The passenger refused to store his duffle bag properly and handed the captain of the airliner a note via a flight attendant that contained aggressive statements addressed to the crew.

The captain of the passenger jet, which belongs to Hawaiian Airlines, made the decision to return back to Portland in order for security officials to take off the unruly passenger.

FoxNews.com quoted Keoni Wagner, a spokesman for Hawaiian Airlines, as saying that the incident had nothing to do with terrorism.

"This is kind of a routine passenger disturbance on board. A guy is being taken off the flight, but it"s not of any particular concern," Wagner was quoted as saying.

Air security has been tightened in the U.S. following a failed Christmas Day bombing attempt over Detroit.

A 23-year-old Nigerian national, Umar Farouk Abdulmutallab, a passenger on board an A330 passenger jet bound from Amsterdam to Detroit on December 25, tried to blow up a plane that was carrying

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