Still more questions than answers in the search for a missing Malaysian Airliners jet.
Investigators still have no idea where the plane is, but there is growing evidence that a deliberate act may have sent the plane thousands of miles off its original course.
U.S. officials say two communications systems on the Boeing 777 shut down separately before the plane disappeared from civilian radar.
Investigators are also exploring whether someone on board deliberately turned the systems off.
The plane had enough fuel to fly for at least another 2,500 miles when it lost contact with air control.
Investigators say the jet continued to transmit signals to satellites for four hours, an indication it may have continued to fly for some time.
Military radar picked up a trail of unidentified blips moving back across the Malaysian Peninsula into the Strait of Malacca. U.S. radar experts believe those blips came from the missing plane.