How could the twin towers collapse?

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Tags

1. #destroyed
2. #collapsing
3. #collapse
4. #followed
5. #nearby
6. #structures
7. #after
8. #tower
9. #south
10. #adjacent
11. #north
12. #towers
13. #other
14. #severely
15. #collapsed
16. #complex
17. #being
18. #damaged
19. #debris
20. #dozen