Reflections on the 20th anniversary of the Sept. 11, 2001, attacks unfold at Ground Zero in New York City, the Pentagon in Arlington, Va., and Shanksville, Pa.

Libby Casey anchors a Washington Post Special Report with reporting and analysis from Mary Beth Albright, Dan Balz, Rhonda Colvin, Ann Gerhart, Hannah Jewell, Joyce Koh, Lee Powell, and Joby Warrick, and analysis by James Hohmann. Read more: https://wapo.st/2VuD2rz. Subscribe to The Washington Post on YouTube: https://wapo.st/2QOdcqK

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