Why did the WTC fall straight down?

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Tags

1. #trade
2. #continued
3. #water
4. #findings
5. #firefighting
6. #unabated
7. #preliminary
8. #stories
9. #impact
10. #manual
11. #collapse
12. #other
13. #world
14. #towers
15. #center
16. #multiple
17. #actual
18. #ignited
19. #damage
20. #fires
21. #primarily
22. #sprinklers
23. #caused
24. #debris