To answer some of the Shadow's questions ...
My understanding from news reports is that the aircraft was departing runway 24, so your suggestion of mistakenly lining up from taxi C on 06 doesn't make sense.
The normal taxi route in YHZ for 24 is by way of the main apron, G, F, runway 15 short of runway 24. To achieve full length of the 8800' runway, one must do a short backtrack and a 180 on the 200' wide runway, otherwise take-off run from the intersection of 15 is 8500' ... minus whatever is lost from lining up.
There is no ground radar in YHZ, nor are there distance to go boards, but it's a CAT 2 runway with centre-line lighting and 3000' to go alternating red/white lights, and red lights with 1000' remaining.
Our airline has our tech/safety people on site now, and along with all the Governmental agencies that are involved, it likely won't be long before some facts are known. Until then, speculation is just that.