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UPDATE: Police investigate potential bomb threat at Dulles airport

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UPDATE: At 11:08 p.m., the MWAA tweeted that the Dulles Daily Garages have re-opened, following a police investigation with negative results. 

WASHINGTON—Officials say that police are currently investigating a bomb threat at the Washington Dulles Airport.

An airport spokeswoman told WTOP that police are checking the two large daily parking garages at Dulles for the bomb threat.

Around 8:30 p.m. passengers began tweeting that their planes were stalled on the Tarmac. Flights were delayed in and out of the airport, but all terminals and runways are now open, said the the Metropolitan Washington Airports Authority (MWAA).

By 9:50 the MWAA said that several garages remain closed as police investigate the threat. The hourly and economy lots are open.