Joe,
The first picture shows massive chunks of the structure flying off sideways at high speed. Where did the force and energy come from? That is pure Newtonian mechanics.
BTW, these buildings were designed to withstand much higher temperatures than that of burning fuel. Videos show clearly that the fire was going out when the explosions went off. The smoke was black which indicates incomplete combustion and a lower temperature due to the shortage of oxygen.
To anyone with training in structures and mechanics – I was a professional civil engineer – it is all pretty obvious stuff.
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