Thick smoke rises over the New York City skyline after the World Trade Center towers were downed by terrorists on September 11, 2001.
Daniel Hulshizer/AP

In photos: The September 11 attacks

Updated 5:54 PM ET, Tue September 10, 2019

Thick smoke rises over the New York City skyline after the World Trade Center towers were downed by terrorists on September 11, 2001.
Dani