The FBI said there was nothing hazardous found on a flight diverted to an isolated part of Reagan National Airport Sunday after a report of a bomb threat.

US Airways plane sits on an isolated runway while authorities investigate bomb threat. (Doris Truong/The Washington Post)

Investigators interviewed the 44 passengers on board, and bomb experts swept the plane.

The plane was in the air and nearing Washington, when someone made the threat at the ticket counter in Dayton, according to the FBI. That person is now in custody.

Two hours after the flight landed from Dayton, the plane was visible from the terminal and still surrounded by flashing lights.

The incident is the fourth aviation-related security issue in eight days. The most recent incident occurred on Saturday when a small aircraft entered restricted airspace around the nation’s capital.

Stay with for more details.

This post has been updated.