The U.S. Federal Aviation Administration said on Thursday it would launch an investigation after the crew on a United Airlines Boeing 737 flight from Key West, Florida to Newark, New Jersey, reported a fire in the cabin.

The airplane diverted and landed safely at Washington's Dulles airport around 4:45 p.m. ET (2045 GMT) on Thursday, the FAA said in a statement. United said the diversion was prompted by light smoke venting from a galley oven.

All passengers deplaned normally at the gate and the airline arranged for a different aircraft to take passengers to Newark on Thursday evening, United added. The plane had 98 passengers and five crew on board.

(Reporting by Costas Pitas and David Shepardson; Editing by Ryan Patrick Jones and Jamie Freed)