24 powerful and moving photos from the September 11 attacks that Americans will never forget

• It's been 19 years since the attacks of September 11, 2001.
• But for millions of Americans, haunting memories of that day are still fresh, and many lives were changed forever. 

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On 9/11, terrorists hijacked four planes and were able to crash two of them into the World Trade Center's twin towers in New York and one into the Pentagon.