UPDATE: The plane has successfully landed safely back at Dulles International, per NBC Washington. It is unclear what caused the mechanical problems.
Air China Flight 818 from Washington Dulles International Airport in Virginia has declared emergency shortly after takeoff.
The plane reportedly suffered a mechanical issue and is now dumping fuel in order to lightening the plane before landing. The plane was scheduled to fly to Beijing. It is unclear how many people are on board.
We will provide more information as it becomes available.
Air China Flight 818 Dulles to Beijing has declared an emergency because of a mechanical issue. It is now dumping fuel and trying to lighten the plane before landing. @nbcwashington
— Haleigh Hoffman (@HaleighHoffman) September 17, 2019