Yesterday, a United Airlines flight from Washington D.C. bound for Oregon was diverted to Chicago’s O’Hare Airport amid security concerns. Reports say three men of Middle-Eastern origin disrupted the flight by arguing with flight attendants, pacing about the aisles of the plane, and passing handwritten notes. The strange behavior of the men came to a head when one of the three sat on the floor next to a flight attendants’ station and began complaining of illness.

Witnesses say when the plane left O’Hare, the three men who had caused the disruptions were not on board.