RE: Airliner crash

I have seen on the news the report of the crash and the rescue of the victims. No burns, no fire on board…..so the explosion happened in cruising. So let´s summarize. Should the plane had encountered a missile…..there would have been fire. A bomb on the plane; I would expect a pilots warning….Total structural failure..unlikely since the plane was checked by Lufthansa in a regular maintenance program. So I suppose something wrong with dangerous cargo could have occured or an explosion in the tanks. Just ideas. These are crashes which make you consider not getting on a plane for the rest of your life.