The world reacted in horror following the Sept. 11, 2001, terror attacks that killed nearly 3,000 people and injured over 6,000 others in New York, Washington, D.C., and Shanksville, Pa. In the days that followed, millions of people around the world paid tribute to the victims with makeshift memorials, and stood in solidarity with the United States. Here are just some of images of the outpouring, captured by news photographers. (Dylan Stableford/Yahoo News)
The images are presented with their original news captions.