Message #235381

[Kristin Moore]

Moment of Impact

Photograph by Spencer Platt, Getty Images

Smoke and flames billow as United Airlines Flight 175 crashes into the World Trade Center's south tower on 9/11, killing everyone aboard and hundreds more inside the building.

In New York, the crashes of two airliners hijacked by al Qaeda terrorists and the subsequent collapse of the twin towers killed some 2,800 people.

(See "9/11: Six Tech Advances to Prevent Future Attacks.")

Published September 8, 2011