Every time a terror act happened somewhere the US noticed an increase in telephon "traffic" in certain areas.We`ve heard anything yet,of course thy don`t have to tell us,buit i think it`s possible something would have been leaked already.
Don`t saying it was no technical faillure,but i thonk one should really take a closer look at the state of mind of the ctp after his wife left him.For some people it could have an devasting effect.
About the possible try to go back to KUL,i´ve have thougt,they would have waited til dawn,fuel was enough,maybe not a good idea to arrive therein the middle of the night with no means for comms.