It sounds to me like it just ran out of gas.
No, the investigators said on Saturday that they were focusing on avionics and electrical systems. Remember, the very first concern in a crash landing situation is fire. Determining whether there was any significant amount of fuel in the tanks or spilled in the crash path would have been accomplished within a half hour of the crash, probably sooner. It’s possible that something caused the flow of fuel to the engines to be stopped, but at this point I think the “ran out of fuel” possibility has been ruled out.
At this point, they’ve already moved the plane off the tarmac — something they most definitely would not have done without establishing whether there was fuel in the tanks. And if the tanks had been breached by the impact and lost their fuel while skidding along, every passenger and emergency ground crew worker would have smelled it — there was a very short distance between the impact and where the plane came to a complete stop.