Unforgettable images from 9/11

Published On: Sep 10 2013 01:19:57 PM CDT   Updated On: Sep 11 2013 01:00:00 AM CDT

A look back at some of the many unforgettable images from the day America was attacked on 9/11.

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NYC Police Aviation Unit

More smoke and debris flood the streets of Manhattan shortly after the collapse of the North Tower.

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