Missing Malaysian Airplane

With no sign of any debris and the tracking system disabled on the Malaysian Airlines flight I'm really starting to wonder if the plane was hijacked and is now in Afghanistan or Pakistan being loaded with explosives or maybe a nuke. If that is the case then what would be happening to the people on board? Do you ransom them or do you kill them so there are no witnesses to tell the world that you now have a 777 ready to blow up some big target.

http://www.nbcnews.com/storyline/missing-jet/crash-expert-malaysia-jet-will-become-criminal-inquiry-n51036