A young college graduate filmed the World Trade Center attack from the fire escape of her Chinatown apartment. For many years, she avoided looking at the footage.

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Prosecutors argued the statements by the defendant, Khalid Shaikh Mohammed, were crucial evidence for the eventual death-penalty trial.

President Trump originally intended to commemorate the 25th anniversary of Sept. 11 with remarks at ground zero, but the memorial’s organizers do not allow speeches. Mr. Trump changed his plans.

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