Originally Posted by
Karel_x
Without more information, we can imagine many real or fantastic scenarios - flaps and/or HS issue, fuel quality, exceeding MTOW, icing, switching off the fuel pumps for buffer tank, birds strike, mid-air collision with drone, SAM, human error, pilot suicide, lost of spatial awarnes and many others. The bomb theory is one among them and it is poor speculation for making the interview more "spicy".
Fuel contamination is not likely - they fueled the buffer tanks only, main tank feeding the engines was full with the Moscow fuel.