All departures from Ronald Reagan Washington National Airport in Washington DC were temporarily stopped due to a reported bomb threat. Flights were grounded for over an hour starting at 11:18 am ET, with passengers being escorted off planes on the runway. The main runway reopened at 12:50 pm, and operations have resumed, although departing flights are experiencing delays averaging 51 minutes. The Federal Aviation Administration confirmed that a United Airlines flight from Houston IAD was the target of the threat and has since issued a statement. The aircraft involved has been moved away from the terminal area for investigation. A video footage shows law enforcement officers gathered near a United Airlines plane on the runway. The halt in flights was initiated following a security emergency at 11:30 am ET. Flight tracking data indicated an unconfirmed threat against a United Airlines aircraft, leading to the temporary cessation of all flights at the airport.