In this special report from Sept. 10, 2011, Bloomberg's Erik Schatzker reports on how Wall Street firms Cantor Fitzgerald, Sandler O'Neill & Partners and Keefe, Bruyette & Woods rebuilt following the Sept. 11 attacks on the World Trade Center in New York. The program features interviews with Cantor Fitzgerald CEO Howard Lutnick, the then-CEO of Sandler O'Neill, Jimmy Dunne, and John Duffy, who was CEO of KBW at the time. (Source: Bloomberg)