As most in Lower Manhattan fled the destruction of September 11, 2001, police, firemen and emergency workers pushed headlong into its maw. A brave few followed in their wake carrying cameras. American Photo is proud to present the stories of the photographers who shot the World Trade Center attacks and their aftermath, told in their own words, and accompanied by the stunning images they etched into history that day. Below is a four-part expanded version of the story found in American Photo magazine's September/October 2011 issue. A further expanded version is also available as a free download for the iPad, with even more photos, photographer interviews and portfolios.