This is the Holy Grail for most 9/11 conspiracy theorists. The official story if im not mistaken is the fire from the other buildings catching diesel tanks on 🔥 at the base and melting beams and collapsing the building.
I believe the main story mainly bc, its not like tower 7 collapsed 15 min after the others. It burned FOR 7 HOURS then collapsed. A lot less fishy if you ask me