Tania Santos of Portugal reaches out to touch names engraved in memory of those who died in the terrorist bombing of the World Trade Center during a visit to the National September 11 Memorial and Museum, Monday, Feb. 25, 2013 in New York. Tuesday will mark the 20th anniversary of the terrorist bombing beneath the World Trade Center that killed six people in 1993. (AP Photo/Mark Lennihan)

Associated Press
Tania Santos of Portugal reaches out to touch names engraved in memory of those who died in the terrorist bombing of the World Trade Center during a visit to the National September 11 Memorial and Museum, Monday, Feb. 25, 2013 in New York. Tuesday will mark the 20th anniversary of the terrorist bombing beneath the World Trade Center that killed six people in 1993. (AP Photo/Mark Lennihan)
Tania Santos of Portugal reaches out to touch names engraved in memory of those who died in the terrorist bombing of the World Trade Center during a visit to the National September 11 Memorial and Museum, Monday, Feb. 25, 2013 in New York. Tuesday will mark the 20th anniversary of the terrorist bombing beneath the World Trade Center that killed six people in 1993. (AP Photo/Mark Lennihan)
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