A bomb threat was reportedly made Wednesday morning on a plane headed for Dulles International Airport.
Federal investigators interviewed all passengers before the plane was released back to the airline. A passenger told News4 that passengers who had used the bathroom were interviewed twice There were 48 people on board.
The plane was supposed to reach Dulles before noon. It finally touched down at about 5:15 p.m., News4's Jackie Bensen reported.
No one has been detained by police.
"Somebody did it, but we've got to draw the right clues to the right person," Piedmont Triad International Airport Executive Director Ted Johnson told the Associated Press.