What time did WTC 7 collapse?

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Tags

1. #world
2. #tower
3. #damaging
4. #heavy
5. #center
6. #south
7. #throughout
8. #collapsed
9. #north
10. #fires
11. #starting
12. #afternoon
13. #building
14. #collapse
15. #debris
16. #continued
17. #september
18. #trade