In this Sept. 11, 2001, file photo, firefighters work beneath the destroyed mullions, the vertical struts which once faced the soaring outer walls of the World Trade Center towers, after a terrorist attack on the twin towers in New York.
In this Sept. 11, 2001, file photo, firefighters work beneath the destroyed mullions, the vertical struts which once faced the soaring outer walls of the World Trade Center towers, after a terrorist attack on the twin towers in New York. MARK LENNIHAN AP
In this Sept. 11, 2001, file photo, firefighters work beneath the destroyed mullions, the vertical struts which once faced the soaring outer walls of the World Trade Center towers, after a terrorist attack on the twin towers in New York. MARK LENNIHAN AP