In photos: Sept. 11, 2001
On a brilliant, sunny Tuesday morning, Sept. 11, 2001, the United States shifted from a nation vaguely concerned about its enemies around the world to a nation ready to declare war on terrorists and on the countries that house and support them.
Image 1 of 26
South tower hit
A fiery blasts rocks the south tower of the World Trade Center in New York City as the hijacked United Airlines Flight 175 from Boston crashes into the building.