
The south tower of the World Trade Center collapses into a cloud of dust and ash as the north tower burns.

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The north tower of the World Trade Center collapses.

Two Iranian women light candles during a vigil in Tehran September 18, 2001 to mourn the loss of life in the United States after hijackers crashed airliners into the World Trade Center and Pentagon September 11. Iran's Supreme Leader Ayatollah Ali Khamenei and President Mohammad Khatami condemned the attacks. REUTERS/Str
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Plumes of smoke pour from the World Trade Center buildings in New York on Tuesday in this photo taken from the Brooklyn borough. Two planes crashed into the upper floors of both World Trade Center towers minutes apart in what President Bush said was an apparent terrorist attack, blasting fiery, gaping holes in the 110-story buildings.
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