Apr 8, 2010 8:18 AM by Stefanie Boe, News First 5
A passenger was subdued by a federal air marshal during an incident aboard an airliner flying from Washington to Denver on Wednesday night, sources told NBC News.
The FBI was investigating whether the man, a Qatari diplomat, attempted to ignite something aboard the plane.
United Flight 663, a Boeing 757 with 157 passengers and six crew members aboard, landed safely at Denver International Airport, airline and airport officials said.
It was uncertain if anything actually was on fire or if this was a joke, NBC reported. Investigators were looking to see what might be in the man's shoes.
Sources told NBC News that the passenger who was subdued was a Qatari diplomat who would have full diplomatic immunity.
After the pilot declared an emergency, military jets scrambled and escorted the jet into Denver, where the plane remains in a secure area, NBC affiliate WRC reported.
Two F-16 fighters, under the direction of North American Aerospace Defense Command, intercepted the plane.
We'll bring you more information on this story as we get it.