Construction cranes work at the World Trade Center, Monday, Feb. 25, 2013 in New York. Tuesday will mark the 20th anniversary of the February 26, 1993 terrorist bombing of the World Tr

 

              Construction cranes work at the World Trade Center, Monday, Feb. 25, 2013 in New York. Tuesday will mark the 20th anniversary of the February 26, 1993 terrorist bombing of the  World Tr
Construction cranes work at the World Trade Center, Monday, Feb. 25, 2013 in New York. Tuesday will mark the 20th anniversary of the February 26, 1993 terrorist bombing of the World Trade Center that killed six people. (AP Photo/Mark Lennihan)