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Flowers are placed over names of vicitims of September 11, 2001 at the South Tower Memorial Pool before memorial observances are held at the site of the World Trade Center on September 11, 2014 in New York City.
Flowers are placed over names of vicitims of September 11, 2001 at the South Tower Memorial Pool before memorial observances are held at the site of the World Trade Center on September 11, 2014 in New York City.

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    Look back at how September 11 unfolded

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Look back at how September 11 unfolded

On the fourteenth anniversary of the September 11 terrorist attacks, CNN looks back at the events as they unfolded.

Look back at how September 11 unfolded

On the fourteenth anniversary of the September 11 terrorist attacks, CNN looks back at the events as they unfolded.