The Federal Aviation Administration on Tuesday temporarily halted traffic at Reagan Washington National Airport after a reported threat against a United Airlines plane.
Air traffic resumed a short while later after all threats were cleared.
The FAA said operations were halted due to an unspecified security issue. The airport said operations were on hold as passengers on a United flight were being offloaded and bused to the terminal.
The plane was removed from other aircraft
A person briefed on the matter said a threat had been made against the plane, and in an abundance of caution, the plane was being checked.
FlightRadar24, a flight tracking site, said the issue was prompted by an unconfirmed threat against a United flight that had arrived from Houston.
The plane was moved away from other aircraft at the airport, and law enforcement vehicles were seen near the plane, according to social media posts. The FAA and United did not immediately respond to requests for comment.
More than 160 flights were delayed at Reagan, according to FlightAware.