UPDATE: 12:15 a.m.
According to @dcairports, the official Twitter account for the Metropolitan Washington Airports Authority: "All #IAD Dulles facilities are open and operating normally. Check w/your airline in the event of residual flight delays. Final update."
Dulles International Airport security personnel were busy sweeping parking garages Monday night, after a bomb threat was reportedly called in to the airport, according to spokeswoman Kimberly Gibbs.
"I believe it was a phone-in threat," said Gibbs, who works for the Metropolitan Washington Airports Authority.
"We are inspecting the garages at Dulles right now," she said, noting that Parking Garages 1 and 2 were being scrutinized. Gibbs noted that the FBI will likely also investigate the threat.
"The economy and hourly lots are OPEN at #IAD Dulles if you are driving/parking here. And the terminals are open," according to a tweet from the official airport Twitter account. The daily garages remained closed around 9:45 p.m. Monday.
Several flights have been delayed due to the bomb threat, Gibbs said, and she urged anyone flying to check with their airline.
Gibbs also urged anyone planning on visiting Dulles to follow @dcairports on Twitter as another way to keep updated on the latest airport news.