FILE - In this Sept. 11, 2001 photo, firefighters work beneath destroyed mullions, the vertical struts which once faced the outer walls of the World Trade Center towers, after a terrorist attack on the twin towers in New York. (AP Photo/Mark Lennihan, File)FILE - In this Oct. 15, 2014 photo, coal miners return on a buggy after working a shift underground at the Perkins Branch Coal Mine in Cumberland, Ky. (AP Photo/David Goldman, File)
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FILE - In this Sept. 11, 2001 photo, firefighters work beneath destroyed mullions, the vertical struts which once faced the outer walls of the World Trade Center towers, after a terrorist attack on the twin towers in New York. (AP Photo/Mark Lennihan, File)
