The latest reports on Malaysia Airlines Flight 370 have only added to the mystery. The Wall Street Journal reported this morning that U.S. aviation investigators and national security officials believe the plane flew for hours after it lost contact with air traffic controllers.

The officials say data was still being automatically transmitted from the Boeing 777's engine to the manufacturer for an additional 4-5 hours. If accurate, this information would widen the search radius by more than 2,500 miles, extending as far west as the Pakistan-India border.

U.S. counterterrorism officials are exploring the possibility that a pilot or someone else on board the plane may have diverted it toward an undisclosed location after turning off the plane's transponders to avoid radar detection.

Malaysian officials, however, say that Boeing and the engine maker, Rolls Royce, have said the report is not true.

On Wednesday night, a Chinese government website said it had located images of possible debris off the southern tip of Vietnam. The report later turned out to be a false lead.

Martha MacCallum discussed the latest on the mystery with former air marshal and Navy SEAL Jonathan Gilliam, who believes that officials wrote off the possibility of terrorism far too early. He said even though people do board planes with stolen passports "all the time" in that part of the world, a plane disappearing in that area makes it worth investigating further.

Gilliam noted that the expanded search radius encompasses many areas where terror groups are known to be active.

Watch his analysis above and stay tuned to Fox News for the latest breaking news on the missing flight.