the likely range of reasons that brought down Malaysia Airlines Flight 370: mechanical failure, pilot actions or terrorism.

I thought it was mechanical failure but I just read that Jet 777 was traced to the skies above a very small island hundreds of miles from the usual Kuala Lumpur to Beijing flight path.

Now I am puzzled and don't know what happened. May be pilot action.

http://www.cnn.com/2014/03/09/opinion/bergen-passenger-jet-mysteries/index.html