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  1. Collapse of the World Trade Center - Wikipedia

  2. 9/11 Timeline ‑ Videos, World Trade Center Attacks | HISTORY

  3. September 11 attacks: What happened on 9/11? - BBC News

  4. September 11 attacks: What happened on 9/11? - BBC News

  5. Timeline of the September 11 Attacks | Britannica

  6. Timeline: The September 11 terrorist attacks | Miller Center

  7. 9/11 FAQs - National September 11 Memorial & Museum

  8. How the September 11 attacks unfolded | Britannica

  9. 9/11 Memorial Timeline

  10. World Trade Center ‑ Development, 9/11 Attacks & Rebuilding - HISTORY