A look back at some of the many unforgettable images from the day America was attacked on 9/11.
The South Tower of the World Trade Center bursts into flames after being struck by hijacked United Airlines Flight 175 at 9:03 a.m. on Sept. 11, 2001. The North Tower continues to burn following an earlier attack by another hijacked airliner, American Airlines Flight 11.
Warner Bros. Pictures
Andrea De Stefani/SXC
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