An injured woman is assisted out of the World Trade Center after a blast ripped through the world's second tallest office complex, killing six people and injuring more than 1,000 people in New York, in this February 26, 1993 file photograph. The Port Authority of New York and New Jersey will commemorate the 20th anniversary of the 1993 World Trade Center bombing on February 26, with a tribute to the six victims and an unborn child who lost their lives during the attack. REUTERS/Greta Pratt