Security emergency at Ronald Reagan National Airport (DCA) after bomb threat on plane, flights placed on ground stop

Flights operations at Ronald Reagan Washington National Airport airport, which were halted due to a bomb threat on a United Airlines flight, were resumed from main runway at 12:50 pm.

source https://www.livemint.com/news/us-news/security-emergency-at-ronald-reagan-washington-national-airport-dca-flights-placed-on-ground-stop-11762278148392.html